typified lightmap

[PatrikLundell]

Summary

None

Purpose of change

Introduce more typed points and tripoints to help keeping track of what data variables contain.

Describe the solution

Went through lightmap.cpp and typified it to a large extent, with side effects elsewhere taken care of.

Describe alternatives you've considered

• Note that there is room for additional work as there are a lot of points I don't really know what they are used for (probably offsets of various types from the relative location worked on). Not addressed, as it would require actually understanding what these variables do.
• I'm also not keen on calling relative locations "offset", as that, to me, indicates adjustments to the relative location you're working with. Not addressed.

Testing

Primitive testing in the form of loading a save and walk around a bit. Given that there should be no functional change, nothing is expected to be seen.

Additional context