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A few strings have their {WINDOW_COLOUR_2} setting removed, since this
prevented strings from being market as inset. All uses of these strings
have been checked.

[ci skip]

Couldn't merge janitosaur's commit or apply a patch after the changes and rebase

This needs to be refactored

- Removed duplicated code
- Moved shared widgets to define
- Moved shared widget handling code to function

- Inset text for disabled labels and values
- Spinners can be held down

Other fixes:

- Use correct types for widget indices
- Use WINDOW_MAPGEN_PAGE_COUNT for arrays (when a new page is added in the
  future, the compiler will warn about all the arrays having an invalid
  size)
- Sort code so that related arrays are placed near each other

Fixed underflow error that was visible for non-tilable maps.
Reordered widgets to reflect the same order of the algorithm.
Always regenerate the map when a setting is changed.

Adds new strings and string ids for some future commits too.

Pretty much just align field assignments