breaking: Change Binning InputFormat and modify GetMCHist

[KSkwarczynski]

Pull request description

Another PR towards "flexible binning".

This focused on how we provide binning in yaml config so this is new format:

  Binning:
    VarStr : [ "RecoNeutrinoEnergy", "TrueQ2" ]
    VarBins: [ [0.,  0.5,  1.,  1.25, 1.5, 1.75, 2., 2.25, 2.5, 2.75, 3., 3.25, 3.5, 3.75, 4.],
               [0.,  0.5,  1.,  1.25, 1.5, 1.75, 2.] ]
    Uniform: true

XVar, YVar was impossible to expand beyond 2D :(

Also GetMCHist no longer require dimension. We do have Get1DVarHist for actual projections.
GetMCHist returns actually used histogram.

For more see: mach3-software/MaCh3Tutorial#212

Changes or fixes

• SampleInfo no longer stores pointer to 1D, 2D hist but we now use actual inheritance of TH1...
• GetPDF now equal GetMCHist as both had same functionality (small step towards ND-FD unification)

Examples

---

• I have read and followed the contributing guidelines.

[github-actions]

Hi @KSkwarczynski, thank you for contributing to MaCh3! Please wait for MaCh3 developers to review your PR. If no one answers within a week, please message people from this list: https://github.com/orgs/mach3-software/teams/mach3admin . While waiting, please enjoy this

Use this action on your projects. Use jokes on issues instead.