Making additional cmd line agruments available in the analysis script

[kjvbrt]

This PR moves all analysis parameters inside analysis function. This allows to provide variables to the analysis. For example additional command line arguments.

Example analysis is adjusted to use this new style:

examples/FCCee/higgs/mH-recoil/mumu/analysis_stage1.py
examples/FCCee/higgs/mH-recoil/mumu/analysis_stage1_batch.py
examples/FCCee/higgs/mH-recoil/mumu/analysis_stage2.py

Quick list of changes:

• All configuration parameters were moved inside Analysis class.
• The __init__() method gets a dictionary of the already parsed command line arguments plus a list of unknown arguments in args['unknown'].
• All configuration parameters are now snake_case, as this is proffered by the python linters.