Submodule Updates & Picom Config Changes

- Update doom-emacs submodule
- Update dracula theme submodules
- Update doom-emacs-config submodule with file extension mode
  association and frame opacity
- Update dwm-flexipatch submodule with deck layout
- Update picom config to vsync at 144Hz instead of auto-detecting
  refresh rate
- Add matlab-schemes submodule for MATLAB editor themeing
- Remove automatically turning picom back on in game_exit.sh because
  it causing visual glitches. Manually turning it back on seems
  to work fine.
- Fix rofi menu icons for picom script
- Use picom "-b" flag instead of running it in background manually
  with "&"

.gitmodules

@@ -90,3 +90,7 @@
 	path = .config/zathura
 	url = git@github.com:dracula/zathura.git
     branch = master
+[submodule ".themes/matlab-schemes"]
+	path = .themes/matlab-schemes
+	url = git@github.com:scottclowe/matlab-schemes.git
+    branch = master