CHANGELOG:
- You can now check for updates from the app itself. Click the "Check For Updates" item in the "About" menu. (commits ab77ed1, 1be6743, b783e68, a56344a, fe02f89)
- Made "Custom CSS" and "Theme Customizer" windows resizable. (commit 37f978b)
- Made heights of all main elements in all of the windows dynamic using flex so they look proper on any resolution. (commits 8ad91b4, 5f576ba, e7f5482, 54be52f, caedc4f, 97e06b9)