Resume failed scripts execution after game reload

[akortunov]

Implements feature #5524.

Use a simple approach so far - once script execution fails during runtime, do not remove its bytecode, mark it as inactive instead.
When try to run a script, early-out when it is marked as inactive.
This flag is cleaned up during scripting system cleanup, during new game start or savegame loading.

Later it should be possible to per-instance blocks, but it is unclear how exactly it should work.

Note that I do not see the code, which removes data from mScripts map, so I assume that data persists for the whole game session.

[psi29a]

It looks alright to me, waiting on AV. Thanks @akortunov