Make constants in PackedVector constexpr

[SiarheiFedartsou]

Fixes old TODO.

Benchmark Results

Benchmark	Base	PR
alias	aliased u32: 1091.83 plain u32: 1103.7 aliased double: 946.009 plain double: 947.178	aliased u32: 1094.02 plain u32: 1086.57 aliased double: 955.325 plain double: 953.975
json-render	String: 6.60321ms Stringstream: 9.26222ms Vector: 6.84999ms	String: 6.56698ms Stringstream: 9.28439ms Vector: 6.85995ms
match_ch	Default radius: 4.47777ms/req at 82 coordinate 0.054607ms/coordinate Radius 5m: 4.47312ms/req at 82 coordinate 0.0545503ms/coordinate Radius 10m: 15.2705ms/req at 82 coordinate 0.186226ms/coordinate Radius 15m: 37.564ms/req at 82 coordinate 0.458098ms/coordinate Radius 30m: 318.241ms/req at 82 coordinate 3.88099ms/coordinate	Default radius: 4.43106ms/req at 82 coordinate 0.0540373ms/coordinate Radius 5m: 4.42271ms/req at 82 coordinate 0.0539355ms/coordinate Radius 10m: 15.0701ms/req at 82 coordinate 0.183782ms/coordinate Radius 15m: 36.8092ms/req at 82 coordinate 0.448893ms/coordinate Radius 30m: 314.393ms/req at 82 coordinate 3.83406ms/coordinate
match_mld	Default radius: 2.84118ms/req at 82 coordinate 0.0346486ms/coordinate Radius 5m: 2.81614ms/req at 82 coordinate 0.0343431ms/coordinate Radius 10m: 10.4999ms/req at 82 coordinate 0.128047ms/coordinate Radius 15m: 26.878ms/req at 82 coordinate 0.327781ms/coordinate Radius 30m: 316.391ms/req at 82 coordinate 3.85843ms/coordinate	Default radius: 2.80181ms/req at 82 coordinate 0.0341684ms/coordinate Radius 5m: 2.79596ms/req at 82 coordinate 0.0340971ms/coordinate Radius 10m: 10.2739ms/req at 82 coordinate 0.125291ms/coordinate Radius 15m: 26.3782ms/req at 82 coordinate 0.321685ms/coordinate Radius 30m: 308.975ms/req at 82 coordinate 3.76798ms/coordinate
packedvector	random write: std::vector 10159.2 ms util::packed_vector 78449.2 ms slowdown: 7.72198 random read: std::vector 10388 ms util::packed_vector 33958.5 ms slowdown: 3.26902	random write: std::vector 10954.1 ms util::packed_vector 82178.4 ms slowdown: 7.50209 random read: std::vector 11107.2 ms util::packed_vector 33510.9 ms slowdown: 3.01703
route_ch	1000 routes, 3 coordinates, no alternatives, overview=full, steps=true 516.621ms 0.516621ms/req 1000 routes, 2 coordinates, no alternatives, overview=full, steps=true 354.636ms 0.354636ms/req 1000 routes, 2 coordinates, 3 alternatives, overview=full, steps=true 640.531ms 0.640531ms/req 1000 routes, 3 coordinates, no alternatives, overview=false, steps=false 152.159ms 0.152159ms/req 1000 routes, 2 coordinates, no alternatives, overview=false, steps=false 97.7101ms 0.0977101ms/req 1000 routes, 2 coordinates, 3 alternatives, overview=false, steps=false 132.8ms 0.1328ms/req 1000 routes, 3 coordinates, no alternatives, overview=false, steps=false, radius=750 152.486ms 0.152486ms/req 1000 routes, 2 coordinates, no alternatives, overview=false, steps=false, radius=750 98.0277ms 0.0980277ms/req 1000 routes, 2 coordinates, 3 alternatives, overview=false, steps=false, radius=750 133.134ms 0.133134ms/req	1000 routes, 3 coordinates, no alternatives, overview=full, steps=true 507.618ms 0.507618ms/req 1000 routes, 2 coordinates, no alternatives, overview=full, steps=true 350.806ms 0.350806ms/req 1000 routes, 2 coordinates, 3 alternatives, overview=full, steps=true 627.321ms 0.627321ms/req 1000 routes, 3 coordinates, no alternatives, overview=false, steps=false 151.31ms 0.15131ms/req 1000 routes, 2 coordinates, no alternatives, overview=false, steps=false 97.3628ms 0.0973628ms/req 1000 routes, 2 coordinates, 3 alternatives, overview=false, steps=false 132.306ms 0.132306ms/req 1000 routes, 3 coordinates, no alternatives, overview=false, steps=false, radius=750 150.321ms 0.150321ms/req 1000 routes, 2 coordinates, no alternatives, overview=false, steps=false, radius=750 97.2103ms 0.0972103ms/req 1000 routes, 2 coordinates, 3 alternatives, overview=false, steps=false, radius=750 135.12ms 0.13512ms/req
route_mld	1000 routes, 3 coordinates, no alternatives, overview=full, steps=true 642.707ms 0.642707ms/req 1000 routes, 2 coordinates, no alternatives, overview=full, steps=true 442.724ms 0.442724ms/req 1000 routes, 2 coordinates, 3 alternatives, overview=full, steps=true 819.727ms 0.819727ms/req 1000 routes, 3 coordinates, no alternatives, overview=false, steps=false 285.043ms 0.285043ms/req 1000 routes, 2 coordinates, no alternatives, overview=false, steps=false 165.497ms 0.165497ms/req 1000 routes, 2 coordinates, 3 alternatives, overview=false, steps=false 304.867ms 0.304867ms/req 1000 routes, 3 coordinates, no alternatives, overview=false, steps=false, radius=750 274.945ms 0.274945ms/req 1000 routes, 2 coordinates, no alternatives, overview=false, steps=false, radius=750 162.144ms 0.162144ms/req 1000 routes, 2 coordinates, 3 alternatives, overview=false, steps=false, radius=750 297.842ms 0.297842ms/req	1000 routes, 3 coordinates, no alternatives, overview=full, steps=true 647.214ms 0.647214ms/req 1000 routes, 2 coordinates, no alternatives, overview=full, steps=true 451.564ms 0.451564ms/req 1000 routes, 2 coordinates, 3 alternatives, overview=full, steps=true 824.172ms 0.824172ms/req 1000 routes, 3 coordinates, no alternatives, overview=false, steps=false 282.454ms 0.282454ms/req 1000 routes, 2 coordinates, no alternatives, overview=false, steps=false 170.298ms 0.170298ms/req 1000 routes, 2 coordinates, 3 alternatives, overview=false, steps=false 299.853ms 0.299853ms/req 1000 routes, 3 coordinates, no alternatives, overview=false, steps=false, radius=750 275.947ms 0.275947ms/req 1000 routes, 2 coordinates, no alternatives, overview=false, steps=false, radius=750 165.832ms 0.165832ms/req 1000 routes, 2 coordinates, 3 alternatives, overview=false, steps=false, radius=750 297.993ms 0.297993ms/req
rtree	1 result: 207.122ms -> 0.0207122 ms/query 10 results: 242.587ms -> 0.0242587 ms/query	1 result: 206.96ms -> 0.020696 ms/query 10 results: 242.299ms -> 0.0242299 ms/query