ImageHeat 0.25.2

Changelog:
- Added changing canvas color feature. Three colors are available: Gray (default), black and white
- Added config file feature. Now program's settings are stored in "config.ini" file
- Added translation feature. Two initial languages are supported for this release: English (default) and Polish
- Rewritten logic for indexed formats. Now there is an additional combobox where palette format can be selected
- Added support for Nintendo Switch swizzling
- Added support for PAL_I8A8 format
- Added tooltip for longer filenames in Info Box
- Fixed bug with mixed shortcuts when using CTRL or SHIFT
- Removed support for some rare pixel formats (e.g. RGB121)
- Added support for showing palette file name in GUI
- Added shortcuts (N/M) for changing palette format
- Removed rawutil dependency completely