[TF2] Fixes for War Paint support + additional item details in several UI

[rabscootle]

Fixes ValveSoftware/Source-1-Games#3520

When dealing with dropped weapons, the live TF client currently typically points to static data in the item schema for weapon details, particularly paintkit IDs and item rarities. However, War Paint items bypass requiring their own respective schema entries and instead have attributes applied to individual instances of base paintkit items. This change meant that while the same attributes were present on war paint items, they were not being picked up by the game for specific UI.

Game code has been updated to extract details from currently held weapon rather than static schema entry for compatibility with War Paint weapons + additional item details.

Fixed rarity and weapon skin name not displaying on dropped weapons:

Additional check for Self-Made quality has been added to match other economy UI behavior.

Dropped weapon UI will also now display additional item details (ie. Australium, Strange Rank). It will also display custom names to their owners:

Fixed rarity and weapon skin name not displaying in playerstatus UI for dropped war paint items:

Fixed color border not updating to match rarity of war paint items in Loadout Selection UI:

[bobatealee]

Love this!

[rabscootle]

This PR is now outdated. You can find updated (better) solutions to this PR in the following entries:
#1756 - Fixes Rarity colors not displaying in affected UI
#1793 - Updated approach for grabbing paintkit index # on dropped war paint items