Motivation / Problem

Inconsistency in the way of writing of enumerators for scoped enums.

Description

Consensus in #9725 seemed to be that for scoped enums we should not use all uppercase but rather CamelCase.

Limitations

Deviates from the coding style in https://wiki.openttd.org/en/Development/Coding%20style. But that's where OpenTTD/wiki-data#15 is for.

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