Add a trivial cgame module which can view a map

[slipher]

Stacked on #1421.

Add a cgame module that simply loads and displays a map, with no entities. It can be useful to quickly test how a map renders or to make sure a simple gamelogic builds correctly in the CI. loadmap is the command to enter a map. The only way to change position for now is setviewpos.

Future directions:

• Add controls for moving
• Draw some help text when not in a map
• Move commands like testmodel to Daemon and build them in
• Load and draw stationary entities

[illwieckz]

is there some plan to make it loaded by default if there is no game?

[slipher]

is there some plan to make it loaded by default if there is no game?

No. The uses I have in mind are renderer testing, and making sure there are no build errors in the shared gamelogic. The way I deploy it for renderer testing is building it in a separate directory and using -libpath to grab its gamelogic.

[slipher]

Fixed color grading in a less hacky way and changed a shader to white instead of gfx/colors/white so it will work with the daemon base pak. Now ready, though #1421 is still waiting.

[illwieckz]

Is there something preventing to name this command devmap?

[slipher]

There is an engine command named devmap. I don't use that since I want to do it without an sgame.

[illwieckz]

LGTM.