Clan tags + ConVar/NeoUI UTF-8 bytes truncation

[nullsystem]

Description

• Be able to set it from the settings
• Networked clan tag via the gamerules, updates only when necessary
• Scoreboard:
  • If all players have the clantag, it'll show the clantag as the team
  • Clantag will prefix [CLANTAG] to the player's name
• Server-side allow/disallow clantag
• Friendly HUD:
  • Spectators will always show clantag
  • Client can toggle if to extend showing clantag to team members during play
• ConVars:
  • neo_clantag - "" by default, Player's set clantag name
  • neo_sv_clantag_allow - 1 by default, Server-side allow/disallow clantags
  • neo_sv_dev_test_clantag - "" by default, DEVELOPMENT + DEBUG-BUILD ONLY, override the clantag text for everyone - development purpose only and not compiled in Release mode
  • neo_cl_clantag_friendly_marker_spec_only - 1 by default, If enabled, only the spectator/non-team will see the clantag next to name for the friendly markers.
• Unicode string truncation:
  • Callback added for neo_name and neo_clantag to truncate by expected bytes
  • NeoUI text edit changed from wchar_t size limit to conversion-resulting char/UTF-8 bytes limit

Toolchain

• Linux GCC Distro Native Arch/GCC 14

Linked Issues

• fixes Clan tag - Left-side of name, right-side of teamname if all players same clantag #267

[Rainyan]

If there's any reasonable way we can deal with this assertion being hit more gracefully, it would be nice:

] neo_clantag "ああああ"

// When opening the scoreboard with the clantag set:
strtools_unicode.cpp (290) : invalid Unicode byte sequence
strtools_unicode.cpp (290) : invalid Unicode byte sequence
strtools_unicode.cpp (290) : invalid Unicode byte sequence
strtools_unicode.cpp (290) : invalid Unicode byte sequence
strtools_unicode.cpp (290) : invalid Unicode byte sequence
strtools_unicode.cpp (290) : invalid Unicode byte sequence
strtools_unicode.cpp (290) : invalid Unicode byte sequence
strtools_unicode.cpp (290) : invalid Unicode byte sequence
strtools_unicode.cpp (290) : invalid Unicode byte sequence
strtools_unicode.cpp (290) : invalid Unicode byte sequence
strtools_unicode.cpp (290) : invalid Unicode byte sequence
strtools_unicode.cpp (290) : invalid Unicode byte sequence
strtools_unicode.cpp (290) : invalid Unicode byte sequence
strtools_unicode.cpp (290) : invalid Unicode byte sequence
strtools_unicode.cpp (290) : invalid Unicode byte sequence
strtools_unicode.cpp (290) : invalid Unicode byte sequence

I'm guessing it's another case of a multibyte character getting cut due to running out of bytes in the allocated buffer.

[nullsystem]

I'm think there's a need to try to restrict the convar string length properly by either callback function or expanding it, but also changing a bit on length checking for the NeoUI text edit. Also a neo_name issue as well from the seems of it.

[nullsystem]

@Rainyan I've added in callbacks for neo_name + neo_clantag to truncate the string when too long, and also altered NeoUI text edit to limit by bytes when it's in char rather than wchar_t length.