Unify widget state image suffixes (disabled, pressed, hover, focus)

- Add a property for arrows image collection (in drop-downs, scrollbars
and production tabs)
- Add a property for separators image collection (in drop-downs)
- Add hover and disable states to the drop-down separator
- Unify button, textfield and checkbox state suffixes

mods/ra/chrome/ingame-player.yaml

@@ -572,8 +572,8 @@ Container@PLAYER_WIDGETS:
 								Image@ICON:
 									X: 6
 									Y: 3
-									ImageCollection: scrollbar
-									ImageName: up_arrow
+									ImageCollection: scrollpanel-decorations
+									ImageName: up
 						Button@SCROLL_DOWN_BUTTON:
 							Logic: AddFactionSuffixLogic
 							Y: 211
@@ -587,8 +587,8 @@ Container@PLAYER_WIDGETS:
 								Image@ICON:
 									X: 6
 									Y: 3
-									ImageCollection: scrollbar
-									ImageName: down_arrow
+									ImageCollection: scrollpanel-decorations
+									ImageName: down
 		Image@SIDEBAR_MONEYBIN:
 			Logic: AddFactionSuffixLogic
 			X: WINDOW_RIGHT - 250