Explicit histograms naming

[lubynets]

1. Added possibility to set the name of histogram as a first argument of AddH1(), AddH2(), AddProfile() and AddIntegral() functions. Existing signatures of mentioned functions are also preserved in order to have back-compatibility.
2. Added possibility to choose whether to fill TH*F or TH*D histograms (where asterisk stands for 1 or 2) - at the compilation time via command line arguments. By default the TH*F histograms are filled, in order to fill TH*D one needs to use -DUSE_THD_HISTOGRAMS=ON cmake option.
3. Modified the .gitignore file with adding a VSCode system directory.

[lubynets]

NB If two or more histograms have the same name (explicitly set by user), it turns to ROOT warning Warning in <TROOT::Append>: Replacing existing TH1: hName (Potential memory leak). If one (1) does not access these histograms by string name, but only operates with them as c++ objects and (2) saves them into different folders - nothing nasty should happen. But anyway this is worth to be avoided by restructuring the logic of procedure: at the moment of histogram creation the output file should be opened and a folder location of histogram should be defined - then ROOT will be able to distinguish them and the warning will disappear.