Import Spanish translation.
Add Color-Grading support to the GL 3renderer.

The look-up tables have to be loaded into 2D-textures first and then copied to
3D textures as we have no 3D texture loaders and also to avoid an in-game
disk access when the cgame switches the color grading in midgame.

neutral.webp contains a 1:1 color mapping table, it can be modified in Gimp
to derive custom color mappings.

Cgame support is very limited so far, only a /testcgrade <image> command to
load a custom color map.
completly separate targets that are aimed at and call-endpoints; copy targets over if there where no call-endpoints specified as a means of backward compatiblity
Color Grading was enabling a white grain map, but it should have been black.
Merge remote-tracking branch 'upstream/master' into entities
add eventType enum; parse and store it based on event in the callDefinition
add several events to fieldtable
refactor entity firing functionnames
add function for eventfiring and let the fromer function do ON_DEFAULT firing
add fields and enum mapping for onDie, onReach and onTouch events
generally fire onReset, onEnable and onDisable events in the right situation for all entities
allow using the special entitynames $self, $activator and $parent as virtual names within calls to reference to according entities relativly