Add widgets for movement mode, bodypart status, weather, and vehicle

[wapcaplet]

Summary

Features "Add widgets for movement mode, bodypart status, weather, and vehicle"

Purpose of change

To flesh out some important remaining widgets, building on #44683

Describe the solution

Add widget variables, JSON definitions, and supporting functions for:

• Movement mode letter (W, R, C, P) and full word (walking, running, crouching, prone)
• Vehicle azimuth (direction in degrees), current/target speed, and percent of fuel remaining
• Weather description (Sunny, Cloudy, Drizzle, Portal Storm etc.)
• Body part status (bitten, bleeding, infected)

Add more widget test cases to cover these and existing stuff.

Describe alternatives you've considered

There is no way but forward

Testing

tests/cata_test '[widget]'

Additional context

Some in-progress screenshots of sidebar using the new widgets:

Driving around with plenty of gas:

Reckless acceleration beyond safe speed:

Backing up:

Low on gas:

New bodypart status text/color indicators (with classic color-coded health bars beneath):

[PatrikLundell]

I don't understand the point of doubling up on movement mode in the screenshots. If there is a point to showing the movement letter (I fail to see it, but there probably is one), it could be crammed in front of the full name "(R) running", "(W) walking", "(C) crouching", "(P) prone". This format would still use less horizontal space than e.g. "Portal Storm", so there shouldn't be an issue of insufficient room for it.

[wapcaplet]

I don't understand the point of doubling up on movement mode in the screenshots. If there is a point to showing the movement letter (I fail to see it, but there probably is one), it could be crammed in front of the full name "(R) running", "(W) walking", "(C) crouching", "(P) prone". This format would still use less horizontal space than e.g. "Portal Storm", so there shouldn't be an issue of insufficient room for it.

The screenshots with both "R" and "running" shown are demonstrating examples of two different widget variables for indicating movement mode, move_mode_letter and move_mode_text. I wanted to show what both of them look like together, so I put them into the same layout as two rows:

{
  "//": "...",
  "style": "layout",
  "arrange": "rows",
  "widgets": [ "move_mode_letter", "move_mode_desc" ]
}

Before this PR, the only indicator fo movement mode was the single-letter version (and it was hard-coded into the sidebar locations where it appeared). But because a red "R" by itself is not very informative without context, I added another widget variable to show the full word, which you can add to your own sidebar if you want it.

Now, you the player have the option of which version you want to see (or both, or neither), and where in your sidebar you want it to appear.

[wapcaplet]

This PR is getting pretty chonky. I will probably peel off a few of the major standalone parts as separate PRs for easier review.

[wapcaplet]

Closing this PR in lieu of these four separate PRs: #53975, #53976, #53977, #53978 - between them, these include everything from this one.