Codechange: Remove per font AA settings.

[ladysadie]

OpenTTD will use the global AA font setting for all fonts from now on.

Motivation / Problem

Description

Console font command allow users to change aa settings per font while the settings UI only allows AA to be enabled/disabled globally.

This change will resolve that inconsistency by removing the per font aa settings and amending the font console command. The font console command was expanded with an option to toggle AA globally. AA state is now consistent across the UI and console output.

Limitations

There's a check to see if the current blitter supports AA. It's not obvious to me when the blitter would be in a state where that would fail. That's not a new quirk though.

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, 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

[PeterN]

I don't think the font command needs to know about the global antialiasing setting, as the toggle in Game Options window is enough. IMHO.

[PeterN]

Can you please squash these two commits together?

It does not make sense to add the global AA toggle in one commit and then remove it in the next.