[WIP] Debug map editor ImGui conversion

[ShnitzelX2]

Summary

Interface "debug map editor ImGui conversion"

Purpose of change

The debug map editor is currently difficult to use because the uilist prompts cover the control interface. Example:

Additionally, I found this UI difficult to use before ImGui was introduced, so I wanted to simplify it.

Describe the solution

Write a new interface for the debug map editor in ImGui.

Screenshots

General UI

"Point" brush with terrain enabled (t_wall)

"Rectangle" brush

Resizing brush

Enabling fields (along with terrain)

OMT mapgen editor

Major differences:

• Each of the map features can be preselected and enabled individually and therefore drawn simultaneously. For example: a wall and a blood splatter can both be placed at once, but if blood is not desired, fields can be toggled off.
• There is now a (paint)"brush" that on the back-end contains most of the UI's state data.
• There are two simple modes: "Draw", which applies the brush selections, and "Select Brush Points", which resizes the brush.
• Terrain info can be toggled off to save space. Most keybind hints are removed to save space (except for the keybinder hint)
• Some uilists are moved to the side of the screen to improve visibility.

Describe alternatives you've considered

• Integrate the debug map editor with mapgen palettes, so that mapgen can be fully designed in-game.
• A copy/paste brush that can save copied selections to user-defined brushes.
• Full mouse support?

Any of the above warrant separate PR(s).

Testing

Mostly-functional, still very WIP.

Additional context

If you have suggestions, please comment. There are some QOL improvements I'm going to make, and there's a lot of commented blocks to remove.

[github-actions]

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

Click to expand

• "Edit mapgen for OMT"
• "dist: %d; u_see: %s; veh: %s; scent: %d"
• " Furniture: %s (#%d); move cost %d; movestr %d"

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.

Hints for adding a new word to the dictionary

• If the word is normally in all lowercase, such as the noun word or the verb does, add it in its lower-case form; if the word is a proper noun, such as the surname George, add it in its initial-caps form; if the word is an acronym or has special letter case, such as the acronym CDDA or the unit mW, add it by preserving the case of all the letters. A word in the dictionary will also match its initial-caps form (if the word is in all lowercase) and all-uppercase form, so a word should be added to the dictionary in its normal letter case even if used in a different letter case in a sentence.
• For a word to be added to the dictionary, it should either be a real, properly-spelled modern American English word, a foreign loan word (including romanized foreign names), or a foreign or made-up word that is used consistently and commonly enough in the game. Intentional misspelling (including eye dialect) of a word should not be added unless it has become a common terminology in the game, because while someone may have a legitimate use for it, another person may spell it that way accidentally.