Technically this probably isn't actually necessary since ThemeManager looks like it should remain allocated until the program quits, but...
Signed-off-by: Kenneth Chew <79120643+kthchew@users.noreply.github.com>
Qt doesn't apply the proper style to elements such as the title bar or text shadows, so this must be done in native code.
Signed-off-by: Kenneth Chew <79120643+kthchew@users.noreply.github.com>