refactor LikelihoodMessage TreeBelief

[dehann]

dropping EasyMessage, NBPMessage,

partial fix of #459

[codecov-io]

Codecov Report

Merging #647 into master will decrease coverage by 0.14%.
The diff coverage is 53.7%.

@@            Coverage Diff             @@
##           master     #647      +/-   ##
==========================================
- Coverage    53.5%   53.36%   -0.15%     
==========================================
  Files          35       35              
  Lines        4233     4149      -84     
==========================================
- Hits         2265     2214      -51     
+ Misses       1968     1935      -33

Impacted Files	Coverage Δ
src/SubGraphFunctions.jl	79.48% <ø> (ø)	⬆️
src/JunctionTreeTypes.jl	38.38% <ø> (+1%)	⬆️
src/IncrementalInference.jl	66.66% <ø> (ø)	⬆️
src/ParametricCliqStateMachine.jl	72.09% <100%> (-0.23%)	⬇️
src/SolveTree01.jl	59.18% <48.64%> (-0.13%)	⬇️
src/FGOSUtils.jl	25.6% <50%> (-0.65%)	⬇️
src/BeliefTypes.jl	70% <62.5%> (+15.45%)	⬆️
src/FactorGraph.jl	72.7% <66.66%> (+0.59%)	⬆️
src/ApproxConv.jl	74.59% <0%> (-1.01%)	⬇️
src/CliqStateMachine.jl	49.68% <0%> (-0.32%)	⬇️
... and 9 more

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