Remove API from player.lua

It's now in game_api.txt

mods/default/player.lua

@@ -1,55 +1,6 @@
 -- Minetest 0.4 mod: player
 -- See README.txt for licensing and other information.
 
---[[
-
-API
----
-
-default.player_register_model(name, def)
-^ Register a new model to be used by players.
-^ <name> is the model filename such as "character.x", "foo.b3d", etc.
-^ See Model Definition below for format of <def>.
-
-default.registered_player_models[name]
-^ See Model Definition below for format.
-
-default.player_set_model(player, model_name)
-^ <player> is a PlayerRef.
-^ <model_name> is a model registered with player_register_model.
-
-default.player_set_animation(player, anim_name [, speed])
-^ <player> is a PlayerRef.
-^ <anim_name> is the name of the animation.
-^ <speed> is in frames per second. If nil, default from the model is used
-
-default.player_set_textures(player, textures)
-^ <player> is a PlayerRef.
-^ <textures> is an array of textures
-^ If <textures> is nil, the default textures from the model def are used
-
-default.player_get_animation(player)
-^ <player> is a PlayerRef.
-^ Returns a table containing fields "model", "textures" and "animation".
-^ Any of the fields of the returned table may be nil.
-
-Model Definition
-----------------
-
-model_def = {
-	animation_speed = 30, -- Default animation speed, in FPS.
-	textures = {"character.png", }, -- Default array of textures.
-	visual_size = {x=1, y=1,}, -- Used to scale the model.
-	animations = {
-		-- <anim_name> = { x=<start_frame>, y=<end_frame>, },
-		foo = { x= 0, y=19, },
-		bar = { x=20, y=39, },
-		-- ...
-	},
-}
-
-]]
-
 -- Player animation blending
 -- Note: This is currently broken due to a bug in Irrlicht, leave at 0
 local animation_blend = 0