0.5 released

Changelog:

* Fixed: ZIP/RAR files with uppercase extensions wouldn't open
* Fixed: Braindead file numbering sorting improved (will sort if there are multiple numbers in file name)
* Fixed: Installer asks if instalation is for all users
* Fixed: Custom width for image fit wouldn't be saved
* Added: Installer can associate file extensions with Quivi
* Added: Unicode filename support, still doesn't work for zip/rar files though
* Added: Portuguese translation