Fixed an indexing error when backing out of the NMD photobooth

Fixed an issue where original layout wasn't being properly disposed of when initing the replacement screen.

Updating indexing function to treat units in order of history instead of original battledata for compatibility with the method used in NMD.

Fixed overlapping text on armory UI

Fixed issue with armoury photobooth text overlapping (already fixed in tactical). None-checked a few other variables to assist in crash handling.

Refactored the UISL into wrapper classes to prevent a CTD when clearing up delegates

Remove UISL delegates on screen closure to prevent GC crash

Added some additional unit validity checks for the solo photobooth

Fixed an issue with the Fast Toggle switch which wasn't respecting invalid units properly and sorted out a minor indexing issue.

Fixed an indexing issue with the fast toggle button