Add: [NewGRF] Station/roadstop animation-triggers 'tile loop' (bit 7) and 'path reservation' (bit 8). - #14080

Motivation / Problem

• Houses, industries, objects and airports have a "tile loop" animation trigger. Stations and roadstops do not.
• Stations have a "path reservation" randomisation trigger, but no animation trigger.

Description

This includes/depends on #14076.

• Add station/roadstop animation trigger "tile loop" (bit 7).
• Add station animation trigger "path reservation" (bit 8).

Limitations

Checklist for review

Some things are not automated, and forgotten often. This list is a reminder for the reviewers.

• The bug fix is important enough to be backported? (label: 'backport requested')
• This PR touches english.txt or translations? Check the guidelines
• This PR affects the GS/AI API? (label 'needs review: Script API')
  • ai_changelog.hpp, game_changelog.hpp need updating.
  • The compatibility wrappers (compat_*.nut) need updating.
• This PR affects the NewGRF API? (label 'needs review: NewGRF')
  • newgrf_debug_data.h may need updating.
  • PR must be added to API tracker