Fix players' inventories being cleared each round

Add Wraith King bot (available on the 1v1 map only by clicking the `Add bot` button)
Fix Black King Bar not providing strength or damage
Fix temporary vision not being granted by abilities or items
Fix ready-up UI not being reset on rematch
Fix shadow amulet buff not being removed on round start
Update Pudge flesh heap values

Add the option to surrender to end the game immediately (players can still vote to rematch after someone surrenders)
Adjust ready-up and rematch UIs
Fix sentry wards having a stock time
Fix dropped Gem of True Sight and Spark Wraith vision not being removed after rounds
Fix Gem of True Sight being removed from players' inventory after rounds
Fix Spirit Bear's inventory and Moon Shard buff being reset after rounds
Fix game starting to lag after enough rounds
Fix some heroes not being able to level up talents
Fix Earth Spirit and Ember Spirit remnant charges not being reset to the correct amount after rounds

Change some internal systems to support future updates

Reset talents each round
Automatically upgrade all abilities except for talents

Fix Monkey King soldiers not being removed after rounds

Fix Monkey King soldiers not attacking or moving
Fix Slardar puddles not being removed after rounds
Fix Arc Warden runes not being removed after rounds
Fix Shadow Demon having infinite Disruption charges
Fix Windranger having infinite Windrun charges

Update loading screen and icon

Fix crash when Axe dies

Remove debugging code