Support VariablePrimalStart

[rschwarz]

closes #95

[codecov]

Codecov Report

Merging #138 into master will increase coverage by 0.32%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #138      +/-   ##
==========================================
+ Coverage   88.04%   88.37%   +0.32%     
==========================================
  Files          21       21              
  Lines         778      800      +22     
==========================================
+ Hits          685      707      +22     
  Misses         93       93

Impacted Files	Coverage Δ
src/MOI_wrapper/variable.jl	85.6% <100%> (+1.11%)	⬆️
src/MOI_wrapper.jl	90.9% <100%> (+1.84%)	⬆️
src/managed_scip.jl	94.28% <100%> (ø)	⬆️

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