[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>

src/yuzu/game/game_card.cpp

@@ -36,7 +36,8 @@ void GameCard::paint(QPainter* painter, const QStyleOptionViewItem& option,
     const auto x_pos = option.rect.left() - (column * cell_width) + static_cast<int>(relative_x);
 
     // also, add some additional padding here to prevent card overlap
-    QRect cardRect(x_pos + 4, option.rect.top() + 4, fixed_card_width - 8, option.rect.height() - margins);
+    QRect cardRect(x_pos + 4, option.rect.top() + 4, fixed_card_width - 8,
+                   option.rect.height() - margins);
 
     // colors
     QPalette palette = option.palette;