Motivation / Problem

Per #9700:

When vehicle is manually stopped by player (either due to aesthetic purposes like first locomotive statue, or as timetable holder, or spare cars holder), its age should not bother - it affect only running vehicles.

The same goes for vehicles stopped in depots.

Description

When a vehicle is stopped (red Stopped status bar, not speed == 0, obviously), don't send warnings about its age.

Closes #9700.

For a test savegame, see old_vehicle_test.zip. Road vehicles 1 and 2 will hit the end of their lifespans within a month of loading the savegame. One is running, the other is stopped inside the depot.

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 save game format? (label 'savegame upgrade')
• This PR affects the GS/AI API? (label 'needs review: Script API')
  • ai_changelog.hpp, gs_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