v26.00-v0.48.0

Release note:

• Update 7z to v26.00
• Update darkmodelib to v0.48.0
• Use git submodules for darkmodelib
• Add basic GUI option for color mode
• Update toolbar icons
• Fix issue with transparent selection with alternative selection mode on
• Use dark message box for progress dialog and menu page
• Tweaks

Note

7-Zip-zstd fork has merged dark mode, so there won't be more binaries from this repo.
Get it directly from https://github.com/mcmilk/7-Zip-zstd