Added the ability for InfoPrinter to print values from different object
collections using the ValueLookupTree class.
Moved the configuration for InfoPrinter to a separate file so the user can
modify it easily.
Merge remote-tracking branch 'upstream/LS1_Upgrade' into valueLookup_tree_event_variables

Conflicts:
	AnaTools/plugins/InfoPrinter.h
Merge remote-tracking branch 'upstream/LS1_Upgrade' into valueLookup_tree_event_variables
Added the ability to use user-defined event variables in cuts and histograms
using the collection "eventVariables".
Fixed a bug in how collections are gotten from the event. Also split up the
object selectors into separate files so they can be compiled in parallel.
Added a few comments.
Merge branch 'valueLookup_tree_event_variables' into LS1_Upgrade