Allow specifying realm when generating docs for a single type and added PlayerInput to docs

luacs-docs/lua/baseluadocs/PlayerInput.lua

@@ -0,0 +1,8 @@
+-- luacheck: ignore 111
+
+--[[--
+Barotrauma.PlayerInput
+]]
+-- @code PlayerInput
+-- @pragma nostrip
+local PlayerInput = {}