@lyonbot : added some fixes to make stylus work more smoothly!

Fixes issue with ios: #7

Possible issue still present: #10

@lyonbot : added some fixes to make stylus work more smoothly!

Potential issue with ios: #7

• Build fixes for Linux.
• Increase bundled ffmpeg to 7.0 on MacOS.

support for building a flatpak

Install from https://flathub.org/apps/io.github.electronstudio.WeylusCommunityEdition

support for building a flatpak

windows build added