MplabProgramFile: Fixed the recognition of XC8 program memory and RAM labels.
Bumped the version to 0.2.3 and added 0.2.3 to ChangeLog.md.
Gemfile: Specify a specific version of Rubocop to use because they recently updated it and made some breaking changes.
rubocop: Increased the maximum class length and fixed some whitespace in order to get everything to pass.
MplabProgramFile: Made more types of variables from XC8 be recognized.  Unfortunately I do not have tests for them yet.
Bumped version to 0.2.4 and added it to the ChangeLog.md.