cache kw descriptions, update to latest SnoopCompile

[aviatesk]

• cache keyword completion descriptions at precompile
• update precompile statements, update to SnoopCompile internal

[codecov]

Codecov Report

Merging #342 into master will increase coverage by 0.12%.
The diff coverage is 84.21%.

@@            Coverage Diff             @@
##           master     #342      +/-   ##
==========================================
+ Coverage   55.67%   55.79%   +0.12%     
==========================================
  Files          43       43              
  Lines        2642     2647       +5     
==========================================
+ Hits         1471     1477       +6     
+ Misses       1171     1170       -1     

Flag	Coverage Δ
#unittests	55.79% <84.21%> (+0.12%)	⬆️

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Impacted Files	Coverage Δ
src/completions.jl	78.77% <75.00%> (ø)
src/precompile.jl	98.31% <100.00%> (+0.02%)	⬆️
src/utils.jl	89.47% <0.00%> (+1.05%)	⬆️

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