[General] Add support for custom missions

[Raffaello Grani]

Instead of having to replace missions in the original game, XWVM could utilize its own custom missions folder to load these. If a custom mission in that folder has the exact filename of an original one, it could override it, which would also be helpful in implementing the mission fix for the German 1994 Edition.

However, if a custom mission has a completely different filename, it could be listed in a separate custom missions menu.

[David Esparza Guerrero]

Added: Feature #97: [General] Add support for custom missions

→ <<cset b3a3342fb019>>

[David Esparza Guerrero]

The way to use this:

Place your custom missions in %AppData%\XWVM\CustomXwingMissions (You need to create this folder if it doesn't exists). Both the BRF and XWI file must be named the same. If you don't provide a BRF file, the briefing room will automatically skip to the flight sim.

Place your replacement missions %AppData%\XWVM\OverrideXwingMissions (You need to create this folder if it doesn't exists). If a BRF or XWI file placed in this folder matches in name one official mission, files in this folder will be read in stead of the official ones.

[Raffaello Grani]

Nice. That was fast. :)