0.9.7 beta 3

Changes since 0.9.7 beta 2:

New simple terrain mapmode!
This mapmode shows any provinces whose terrain is explicitly defined, rather than being derived from terrain.bmp. In EU4 it uses the overrides lists in terrain.txt; in CK2 and V2 it uses province history files.

Improved CK2 support:

• Editor now correctly parses sea zones from default.map
• Editor no longer hangs in title mode when a title is defined in history as its own liege
• Editor can once again find province entries inside save games
• Editor no longer attempts to parse .info files inside common folders

Fixed an issue causing Victoria 2 map mods to not be loaded correctly when default.map points to "../<modname>/map/definition.csv".