Since nobody really said yes or no or what theme we should finally use, I just made #3129 to get some drive into this topic and hoping to get it done finally.
This PR includes the "Prof-Gnome" from our [geany/geany-osx](https://github.com/geany/geany-osx) repository and makes Geany look a lot better on Windows. Maybe not 100% perfect and native but usable.
To let you easily test: https://download.geany.org/snapshots/geany-1.39pr3129_setup.exe https://download.geany.org/snapshots/geany-plugins-1.39git20220220_setup.exe