Investigate script cleanup after terminate

[x87]

Do you know why scripts are not deleted immediately after terminate?
Terminated scripts are placed into ScriptsWaitingForDelete and deleted only on game exit/restart.

Originally posted by @x87 in #552 (comment)

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So, if you load/terminate custom script in a loop, you don't deallocate memory and can potentially run out of it, unless you reload the game.

Originally posted by @x87 in #552 (comment)

[x87]

I'm not too worried about this issue in general, as it seems to have been part of CLEO code for the last decade, but the accumulated memory can be a reason for random crashes on long game sessions.

I think we should keep at most one copy of the script in the pending delete state, and if you start another instance of the same script, we should delete the first instance and free up the memory.

This, however, poses some difficulty, as new instance can be started with different set of input params, effectively activating completely different logic. Example:

if is_game_first_start
then
   stream_custom_script "logic.s" {arguments} 1
else
   stream_custom_script "logic.s" {arguments} 0
end

logic.s

if 0@ == 1 // this is the first time launch
then
  patch_memory()
  terminate_this_script
else
   do_something() 
end

So, if you start the same script after terminate with the same input arguments, it may justify forcing cleanup on terminated instance before starting a new one.