Fix a couple things that bother me

[PennyJim]

These are just things I noticed while working on my other pr's that bothered me.

1. calling script.on_event with an array of events. This overrides FMTK's ability to type the EventData
2. doing floor(random()*300) instead of random(300)-1
3. Always registering entities for on_object_destroyed despite it not actually being a lab we care about
4. Fetching a LuaSurface after discarding it in iteration
5. Unused field researchColor.validated
6. Using get_technology_filtered without a filter, which is identical to just prototypes.technology
7. Looping over a map instead of just indexing into it
8. Using the # operator on an array you're building. A minor one, but something that still bothers me.

I would also like to add luals annotations to everything, but that's best done on top of all my changes. It also doesn't actually functionally change anything besides make it easier to work with.