FreezeTag: autorevive progress

• Start the automatic reviving progress as soon as the player gets frozen (cvar g_freezetag_revive_auto_progress, enabled by default) to let frozen players know that they'll be autorevived at some point and to let teammates estimate time remaining until the autorevival by looking at the health bar
• Show autorevival progress of frozen players as waypoint health bar rather than normal health bar, which is barely visible for red players
• Change default light blue Frozen waypoint to orange Reviving waypoint when a frozen teammate is getting revived
• time needed to revive frozen players slowly gets shorter doesn't change
• Reduce auto-revival time when frozen players are hit by enemies (time reduction depends on hit force). Optionally this behaviour can be enabled when frozen players are hit by teammates too