Release v0.5

Changelog:
Done - F16: Upgrade GvinPaint to working version.
Done - F16.1: Add properly canvas drawing in Paint.
Done - F16.2: Add file saving and loading.
Done - F16.3: Add colors palette.
Done - F16.4: Add tools
Done - F41: Add wallpaper path to the configuration.
Done - F38: Add standard error text with function name for every error.
Done - F53: Add OpenFile window reacting on Enter key.
Done - F52: Add delete key handling in FileManager.
Done - F48: Add renaming to the FileManager.
Done - F51: Add question in FileManager when trying to delete file or
directory.
Done - F46: Add file deselection in FileManager on left click in empty
space.
Done - F49: Add "Set as active" button in TasksManager.
Done - F45: Update TasksManager to change old-style scroll-bar.
Done - F47: Add autosizing option in PopupMenu component and possibility
to disable it.
Done - F50: Add events queue.
Fixed - B6: [Issue #6] Fix scroll bar roller not properly positioned on
the edge values.
Fixed - B7: [Issue #7] Fix file manager error with file/directory names
duplication.
Fixed - B8: [Issue #8] Fix not moving titles of windows when moving
windows horizontaly.
Fixed - B9: [Issue #4] Bug is still reproducible. Fix paint crash when
moving out of the screen. Possible error with scroll bars.
Fixed - B10: [Issue #10] Fix desktop context-menu showing on right click
on program window.
Fixed - B11: [Issue #11] Fix popup menu not reacting when out of the
main window.
Fixed - B12: [Issue #12] OpenFile: Backspace key not processing in Edit.