- Always use the Oxygen icon theme. Qt6 has a built-in monochrome icon
theme on Windows 10, but it's missing some icons.
- On Windows 10, set the style to fusion. Qt's "Windows Vista" style
(now "Modern Windows") doesn't support Dark Mode, but fusion does.
- Manifest: Add Windows 8, 8.1, and 10 OS GUIDs.
- resource.rc: Use the CreateProcess manifest ID, not IsolationAware.
IsolationAware is only for DLLs. Without the CreateProcess ID,
on Windows 10, GetVersion() and the version helper functions will
assume we're actually using Windows 8.
IDI_APPLICATION is defined in Windows headers as the "default" application
icon, with resource ID 32512.
resource.rc: IDI_QRVTHTOOL, not IDI_KEY_VALID. Besides the fact that this
is wrong (and is a copy/paste error from rom-properties), this caused the
icon to be defined using a name instead of an ID.