[efi] add Windows 7 EFI support for XP and Vista

* Requires 7-Zip for WIM extraction as wimgapi.dll is not available
* Also add more comprehensive choice between MBR/GPT and BIOS/UEFI
[misc] set rufus-next to 1.3.2

* Also fixed a couple Clang, MSVC Analyzer and MinGW64 warnings