Propagate !824 from master to 2018-patches

Catboost integration into MuID

(cherry picked from commit ac0a9df7)

afd058a3 Initial catboost integration. Surprisingly easy.
93bc6d06 Put the model file to a public place
69ea5726 Moved Catboost to a separate LHCb package.
38eb5f72 Added the capability to run TMVA & Catboost simultaniously
774dfdfd Switched to new CatBoost interface. Paths are hardcoded, waiting for the LCG release
0c7a6079 Added FindCatBoost.cmake. Now need to put it to a proper place...
52448906 removed debug output
cbe4c6fc Added find_package(catboost)
16a1268f Added proper CMake&LCG integration
6c3eb44e Old catboost evaluator removed, model path updated
17158f1a Switched Catbootst to RawFormulaValue
bfa7fa31 Remove hardcoded LCG path
e4a354fe Added the fast standalone evaluator
63a76091 Whitespace
07129818 Whitespace
3d0d4adf Removed old shared files
6130c45d Removed a stray header, added back needed ones.
d3319745 Added the data package for weights
821626c6 Switched to smaller model by default
bcb47fc8 Set all search paths to production values
252ccbf6 Warnings fix
e9965c4f -Wstrict-aliasing fix
f4522edf Non-writing Muon MVA outputs bug fix
6b158f77 Getters style fix