[desktop] More qt_common reorganization (#3916)

Ported from QML branch.

Main "big" change is that EmuThread is now a shared state in QtCommon,
not individually managed/passed around by GRenderWindow and MainWindow.

Signed-off-by: crueter <crueter@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3916
Reviewed-by: Lizzie <lizzie@eden-emu.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>

cpmfile.json

@@ -112,7 +112,8 @@
         "options": [
             "QUAZIP_QT_MAJOR_VERSION 6",
             "QUAZIP_INSTALL OFF",
-            "QUAZIP_ENABLE_QTEXTCODEC OFF"
+            "QUAZIP_ENABLE_QTEXTCODEC OFF",
+            "QUAZIP_BZIP2 OFF"
         ]
     }
 }