Windows/MacOS support

[qarmin]

For now development is focused on Linux, but with little(or even without any) changes it should work also on MacOS.

Probably GTK is the biggest issue for providing multi OS support.

Windows port will require some changes in code, because it works fine now only with directories which starts with /.

For now this issue is very low on my TODO list, but maybe someone want to push changes to change that.

State of cross-compilation from Linux(needed for providing official binaries)

Tool	Windows	MacOS
Czkawka CLI	X	X
Czkawka GUI Orbtk	X	?
Czkawka GUI GTk	X	?

Compilation state when building Czkawka for native OS

Tool	Linux	Windows	MacOS
Czkawka CLI	X	X	X
Czkawka GUI Orbtk	X	X	X
Czkawka GUI GTk	X	-	?

Legend

X - works
- - not works
? - doesn't checked

[marleyjaffe]

Push to change that for OSX :)

[qarmin]

Still I don't know how to properly setup GTK to cross compile Czkawka on Windows or MacOS.

Instructions from https://infrastructure.pages.gitlab.gnome.org/gtk-web/docs/installations/ only applying to compilation on native OS(but still I couldn't figure how to compile Windows Czkawka GTK on Windows).

For MacOS I'm unable to check if anything works since I don't have any device with it, so some other people need to check if it compile and works fine there(CI artifacts may help to provide official binaries).

So until I figure out how to compile Czkawka on Linux for Windows and MacOS, there will not be an official binaries for them.

[qarmin]

Windows version is still early WIP(don't know why but there is only available white theme)