Reduce executable size in windows

[pubudu-ranasinghe]

The current freeze output is about 120MB in windows. This can be reduced significantly by manually removing the unnecessary files bundled with pyinstaller. So we need to write a post build script that will delete the files from target directory.

The list of unnecessary files can be identified later and would ideally be defined in build/settings/{platform}.json or in separate text files.

Refer to this issue on how this can be done.

Need to do some trial and error to identify the unnessary files.
Identified for now

• Almost everything in target\Turnip\PyQt5\Qt\bin
• Unused image formats like webp in Turnip\PyQt5\Qt\plugins\imageformats
• Languages Turnip\PyQt5\Qt\translations