Major Update of LMVM Analysis

• Introduce 2D Elid Cuts in CbmLitGlobalElectronId
• Implement a Fast Simulation Procedure for an artificially enhanced background (LmvmRandomEvent)
• Calculated Combinatorial Background (CBcalc): Implement it in seperate classes and macros to enable large and fast mixing depth (LmvmCBCalc)
• Add method to easily create histograms with variable bin widths (VaryBinWidth) from origin histograms
• Add temperature calculation/estimation from fit of di-lepton spectra
• Various other small implementations/changes