Changes

• Fix incorrect error message in RMG-Core
• Fix possible crash on Windows (thank you @Thirteen1355 for assisting with debugging)
• Fix missing space between 'L-Shoulder' and 'R-Shoulder' in RMG-Input
• Fix 'L-Trigger' and 'R-Trigger' names by changing it to 'L-Shoulder' and 'R-Shoulder' in RMG-Input
• Improve opening time of 'Edit Game Input Settings' by utilizing the ROM browser cache
• Improve configuration dialogs from plugins by setting the parent window