Run init-script only once after a sector has loaded

[tobbi]

Fixes #698

[Narre]

This is a great option to have, especially for infinitely looping scripts that are only meant to trigger once, such as a loop that randomises the time between lightning strikes, however, I think there remains the need for scripts that are triggered every time on sector entry (such as my STAGE project, that needs to check for changes made in other sectors when a sector is entered). I have a few possible solutions in mind.

• init script is triggered every time the sector is entered, much as it works now, but its execution is terminated when the sector is unloaded (so it gets triggered again upon re-entry but the old instance does not continue running)
• there is an option in the sector settings that determines whether the init script should only trigger once upon the sector being loaded, or every time
• there are two separate scripts, the init script that's only triggered on first initialisation, and an enter script that's triggered every time (in this case, I think it would be better for retrocompatibility if existing init scripts in old levels are interpreted as enter scripts, so they work how they did in the version they were written in)

[tobbi]

Basically you want an option that you can check to specify whether it's run every time. I think I need to also reset the flag when the sector is reset.

[tobbi]

Discussion question:
Should I keep the default of "run every time" for backward compatibility reasons, but make an option of "run only once".

Can I get some input on this?

@Narre @tylerandari13 @Vankata453

[Vankata453]

Yeah, I believe a script to run only on sector initialization should be a separate option.

[Narre]

I agree, with both options available, the default should be the old behaviour to avoid needlessly breaking older levels.

[tobbi]

This is ready for review. I haven't tested the actual behaviour but to quote "I, Robot": "My logic is undeniable".
https://www.youtube.com/watch?v=LH-G8c3TUac

[tylerandari13]

Every time you load a sector it replaces all the instances with new instances. Is this also gone with this PR or is that untouched?

[tobbi]

Every time you load a sector it replaces all the instances with new instances. Is this also gone with this PR or is that untouched?

What do you mean by "instances" in this case?

[tylerandari13]

Every time you load a sector it replaces all the instances with new instances. Is this also gone with this PR or is that untouched?

What do you mean by "instances" in this case?

Basically the exposed objects. (theyre referred to as instances by Squirrel)

[mrkubax10]

I suppose second line could be replaced with (!m_init_script_run_once || !m_init_script_run).