added new concept for LuaCallback annotation: limited direct calls. this allows defining the number of times a method may be called directly per tick, to limit the load Lua programs can but on the game, for example if the method has to use some expensive resource or generates network traffic. used for gpus, to allow different tiers to be updated with different speeds: set/fill/copy are now direct until they hit the limit. this makes for a much more responsive experience while still making sure Lua cannot completely blow the net traffic off the charts; also made some more getter methods in filesystem direct (in particular `size` which slowed down ls -l way too much); fixed a deadlock, possibly; screens now consume a constant amount of power and will stop displaying stuff when unpowered (won't lose the buffer, though)
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