* fix(script-mgr / lua): first kill all scripts, then unload lua modules: because the lua scripts depend on lua state (which is stored inside lua module instance), killing the lua module first would not allow proper cleaning because of the lua state getting destroyed while the lua script might still be running.
* fix(unloading): Why even reset the fiber pool here?
* fix(lua): don't allow for io / os lua lib to be accessed for security reasons.
* fix(lua): Potential fix for C stack overflow error by using lua coroutine yielding instead of calling fiber yield directly from lua functions.
* feat(unloading): allow to unload in the main title screen. Also revert 309c374602 due to fiber pool being potentially exhausted, we want commands to have their cleanup code ran in priority.
* fix: script manager and lua scripts: change the api so that the m_scripts array is only modified in a specific safe location: before it gets ticked.
* fix script manager: don't expose the script vector directly, for multithreading safety
* fix lua manager usage: don't iterate the module array without locking, nor un/load module from a script thread
* lua script: only do actual loading of lua modules in script mgr
* lua native bindin: fix pointer parameters, out C style parameters are returned as multiple return values lua-style
