Changes

• Fix drag and drop not working in the loading screen of the ROM browser
• Fix ROM browser not refreshing when launching RMG with a ROM specified through the commandline, using drag and drop and then returning to the ROM browser
• Fix ROM browser refreshing with '--quit-after-emulation' specified through the commandline after a ROM has finished executing causing some extra debug callbacks to be displayed
• Fix ROMs which have a ROM header name with 20 characters without a 0 byte at the end (fixes a crash on windows)
• Improve build process by automatically detecting whether 'std::format' is supported or not (if not, use libfmt)
• Improve message box behavior when there are a lot of errors
• Improve default directories on windows (it'll now use '%APPDATA%\RMG' unless 'portable.txt' or 'Config\mupen64plus.cfg' exists)