IcoFX 2.1

# New features:
* "Add Noise" dialog
* Option to have fixed zoom
* Show message if cannot subtract from selection
* [Fixed] Reinstall/uninstall while IcoFX is running was not successfull
* [Fixed] Image was not refreshed correctly when drawing with some tools at the border of an image
* [Fixed] IcoFX crashed if a file was opened from the Explorer panel and the panel was on a different monitor
* [Fixed] Flickering during window maximizing
* Improved brush resizing algorithm
* Simplified installer
* Minor enhancements
* Removed "Download Language" dialog