Minor bug fixes + first pass at MCS

Updates to the analysis tools:

Added reconstruct_mcs_energy post-processor (needs to be optimized)
Added adjust_interaction_topology post-processor to update the topology of interactions based on KE cuts
Removed reconstruct_momentum which is now a simple property of TruthParticle objects by default
Fixed bug that would not allow the post-processors to run without matcha installed
Fixed bug that would make it impossible to initialize Geometry without source/opdets files
Fixed bug when running CSDA/Vertex post-processors on TruthParticle objects

DeepLearnPhysics / lartpc_mlreco3d