Bugfixes in multiple folder support

- added getter methods for language- and user-specific root folders
- fixed issues with dialogF.tlk
- changed search path order
Bugfix in GAM file support
Merge remote-tracking branch 'upstream/devel' into devel
Restored compatibility with Java 6
Added support for PVRZ resources

- export possible to PVRZ and BMP format
New TIS Viewer and updated Area Viewer

- added support for both plain old and PVRZ-based TIS variants
- implemented new Swing component TileGrid
Multithreading support for TIS viewer
BGEE MOS file support added
Merge remote-tracking branch 'upstream/devel' into devel
Merge branch 'devel' of https://github.com/Argent77/NearInfinity into argent77-devel