Digest, Country, Mapmods, Side, minor changes

- Added the ability to 'lock' a file through the Digest
- Countries are now written to the map file if they are local or have
modifications
- Countries that have the same ID as a House (meaning the Country is
global) will not be written to the map file as it would merge with the
House's section
- MapMods will now write based on a certain order, first come generic
sections then FOA sections (and their types) then the rest
- Side has been expanded to have proper listing of its Countries
- Added methods to Side to resolve the index or side name of a Country
- Added a method to MapObjectList to see if an ID exists
- Renamed some methods (sectionExists)