Compile Pal V027.12

Fixed multi-level radar packing
Fixed $iris textures failing to pack
Fixed bad regex in Pack step
Reenabled ability to reorder all compile steps

Added errors when internal path cannot be resolved
Added -addfilelist and -usefilelist parameters to Pack:

• Add File List adds all files in a file list
• Use File List uses an existing file list to pack assets, disabling automatic packing detection
• File lists should follow the BSPZIP file list format: https://developer.valvesoftware.com/wiki/BSPZIP#Adding_a_list_of_files