* Vox event icons, turfs and props.
* Ported vox prosthetics from Bay.
* Added icons for the vox simplemobs.
* Vox now apply default colours and markings in set_species().
Tweaks Travis to compile all PoI maps in order to allow the compiler to find certain problems such as missing paths. This is needed because PoIs are loaded at runtime as opposed to being compiled like traditional maps, making them a bit prone to problems. Travis should help find those problems before they reach the live server by failing PRs which add a broken PoI map or break any existing PoI maps.
For regular use, the PoIs will not be compiled unless done so manually by the developer.
