Fix negative glyph index in Team Arena text functions

Team Arena's text functions cast signed char values to int and use as an array index.
This works fine for values 0 to 127, but not for -128 to -1 which are a negative array index.
Instead use "character & 255" like client and original Q3 ui/cgame string drawing code.
mint-arena: Workaround Team Arena fonts missing 'ÿ'
mint-arena: Make TA voice chat head stick to left side in widescreen

The HUD is drawn centered, but voice chat head should always be at left side
so that console notify/chat text doesn't draw over it.
mint-arena: Don't offset notify text when voice chat head is not showing

Allow voice chat head to time out even when it's not being drawn.
Voice chat head is hidden when scoreboad is showing, so don't offset notify text.
mint-arena: Don't print voice chat message for local players not in game
mint-arena: Remove showing voice head in CG_PlayVoiceChat

The voice head menu is open/closed for each splitscreen viewport as needed.
mint-arena: Fix G_TeamCommand possibly sending to all teams

Must check if localPlayerNum is -1 (meaning player not in game) before using
it as an array index.
mint-arena: Fix reward icon centering
Fix bot's teamleader name field being too short

Players using names with 32 to 35 characters could not be recognized as
the team leader.

Reported by Razor.
mint-arena: Move SnapVectorTowards to bg_misc.c
mint-arena: Add [c]g_unlagged.c from Unlagged 2.01 GPL
mint-arena: Change [c]g_unlagged.c license headers
mint-arena: Add [c]g_unlagged.c to the build system
mint-arena: Remove static from some cgame functions for Unlagged
mint-arena: Add g_unlagged.c function prototypes
mint-arena: Port g_unlagged.c to this codebase

Also, add some of the gplayer_t fields and disable cg_unlagged.c
so "make BUILD_UNLAGGED=1" can compile.

Based on changes made by @ChicagoPraiseTheDarknessDev.
mint-arena: Add unlagged backward reconciliation function calls
mint-arena: Fix unlagged TeleportPlayer

Call G_ResetHistory after updating r.currentOrigin.
mint-arena: Fix unlagged PlayerSpawn

Call G_ResetHistory after updating ent->s.mins/maxs.
Clearing player->saved.leveltime is done with the player is memset to 0.
mint-arena: Add full lag compensation option