Fix most build warnings, clean up projects

[idigdoug]

• Add PnpLockdown to all INF files that need them.
• stdunk.h declared inline operator new/delete, but this was a mistake, so the declarations are now deprecated and trigger a warning. Fix by opting-in to the new system and declaring our own operators.
• Clean up the auto-migrate junk in vcxproj files.
• Replace deprecated ExAllocatePool with ExAllocatePoolWithTag.

Still two build warnings remaining due to use of BootCritical in the INF files of the SD drivers. Not sure if there is a good way to fix those.

[mariobalanica]

Thanks for the contribution!