Strategies rework

[vitornesello]

Implementation of the strategies philosophy last discussed.

[codecov-io]

Codecov Report

Merging #67 into master will increase coverage by 0.12%.
The diff coverage is 80.76%.

@@            Coverage Diff             @@
##           master      #67      +/-   ##
==========================================
+ Coverage   81.86%   81.98%   +0.12%     
==========================================
  Files          33       32       -1     
  Lines        1450     1460      +10     
==========================================
+ Hits         1187     1197      +10     
  Misses        263      263

Impacted Files	Coverage Δ
src/types.jl	73.33% <ø> (ø)	⬆️
src/Coluna.jl	100% <ø> (ø)	⬆️
src/parameters.jl	100% <ø> (ø)	⬆️
src/solvers/solver.jl	77.77% <ø> (ø)	⬆️
src/decomposition.jl	98.92% <100%> (ø)	⬆️
src/problem.jl	88% <100%> (ø)	⬆️
src/MOIinterface.jl	58.53% <100%> (+1.3%)	⬆️
src/strategies/strategy.jl	62.5% <50%> (-12.5%)	⬇️
src/strategies/treesearch/simplestrategies.jl	50% <50%> (ø)
src/reformulation.jl	79.16% <66.66%> (ø)	⬆️
... and 3 more

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