to date if you use async preload we still load the header
synchronously and this can be horrible especially with generic
loaders. there is no way to farm this off to the preload thread. now
there is. youhave to set it as a skip head load option before doing a
file_set AND you need to issue a preload ... but now it's possible.
@feature
Typos, lack of NULL check, excessive sizeof(type) not matching
the object type, no border set, etc... This all lead to a crash
and then no render (with an error message and then without...).
This also simplifies the implicit loading of ETC1 as ETC2 when
supported by the driver.
@fix