Keyboard support for production palette:

y/u/i/o/p map to Buildings/Defense/Infantry/Vehicles/Aircraft.
Tab or successive y/u/i/o/p will switch tabs within a category.
Successive clicks on category icons will also switch tabs.
Shift + keyboard/click cycles tabs in reverse.

mods/cnc/chrome/ingame.yaml

@@ -185,30 +185,35 @@ Container@INGAME_ROOT:
 									Width:30
 									Height:30
 									Text: B
+									Key: y
 								Button@DEFENSE:
 									Id:DEFENSE
 									X:35
 									Width:30
 									Height:30
 									Text: D
+									Key: u
 								Button@INFANTRY:
 									Id:INFANTRY
 									X:70
 									Width:30
 									Height:30
 									Text: I
+									Key: i
 								Button@VEHICLE:
 									Id:VEHICLE
 									X:105
 									Width:30
 									Height:30
 									Text: V
+									Key: o
 								Button@AIRCRAFT:
 									Id:AIRCRAFT
 									X:140
 									Width:30
 									Height:30
 									Text: H
+									Key: p
 				ProductionTabs:
 					Id:PRODUCTION_TABS
 					PaletteWidget:PRODUCTION_PALETTE