mint-metal: Fix ritualfont glyphScale
mint-metal: Add tiki object spawning in cgame

Spawn tiki objects used by FAKK/Alice. Requires engine to support .tan
(Ritual's md3 based format). Support for '.tik' files is very limited.
Also, tiki loading will need to be done in both game and cgame VMs.
This works for visual testing, but not much for being able to pick up items.

Fixes skies in many maps (they use a model for sky portal scene), which is
why I started working on this.