InfoMapping.py: Restrict the scope of Editorconfig mappings based on the files they target

[satwikkansal]

All the Info classes yielded by EditorconfigInfoExtractor contains a scope field which represents the target files of that information in "editorconfig-style-file-glob" format.

This involves:

• Parsing the "editorconfig-style-file-globs" into standard globs.
• Adding a field name applicable_globs or target_globs in the InfoScope class and then modify the check_belongs_to_scope method to also check that:
  • section["files"] (files targeted by section) is a subset of applicable_globs (files for which the Info is valid), failing which
  • we should either not use the Information to fill the setting values
  • or we may create seperate sections for the intersection globs of these two fields.