add SKIP_VERIFICATION option and --noverify cli flag

[nornagon]

Summary

None

Purpose of change

While developing, it's common for me to relaunch the game frequently to test
C++ changes. The verification step takes quite a long time, and especially for
UI changes, is wasted time—it's testing the same thing every time.

Describe the solution

Add an option to turn this off, as well as a CLI flag to skip it for ease of
access when developing.

Describe alternatives you've considered

Perhaps this should be a CLI flag only? The option was the easiest way I could
find to plumb the bool from the CLI to the init code, but it wouldn't be too
hard to add a global or some other plumbing instead.

Or, the verification step should only run if some input to it has changed (e.g.
if the flatbuffer cache was updated).

Testing

Additional context

[github-actions]

Spell checker encountered unrecognized words in the in-game text added in this pull request. See below for details.

Click to expand

• If enabled, this skips the JSON verification step during loading. This may give a faster loading time, but risks JSON errors not being caught until runtime.

This alert is automatically generated. You can simply disregard if this is inaccurate, or (optionally) you can also add the new words to tools/spell_checker/dictionary.txt so they will not trigger an alert next time.

[ZhilkinSerg]

Need to make sure that no consistency check function does anything with the objects that normally should go to finalize function.

[nornagon]

Need to make sure that no consistency check function does anything with the objects that normally should go to finalize function.

I checked through every function in check_consistency. Almost all of them are const and/or call const functions or use const iterators. So we're at least moderately safe :D

I fixed a few that didn't const, and a couple of things were actually doing mutations in check_consistency—specifically, a couple of values in emits were being clamped if out of range, and a scenario allowlist was derived. I moved both of those to the finalize step.