Custom conversions can be used by:
* Providing a converters.py in the main directory with a convert()
function
* Specifying --custom on the fxconv command-line or using a subfolder or
assets-{fx,cg} unused by standard fxconv
This commit introduces the libimg image format, selected with the option
type:libimg-image. To avoid confusion with the bopti image format,
options -i and --image are now deprecated and should be replaced with
--bopti-image or type:bopti-image. The fxSDK Makefile has been updated
accordingly.
To support the construction of a structure that contains a pointer in
fxconv, an assembly-code feature has been added. The structure itself is
assembled with as and then linked with the data proper. This allows the
structure to reference the data by name and have the pointer calculated
by ld at link time.
This change enhances the style of fxconv by using more classes and
generally more Pythonic constructions.
It also introduces image conversion for fx-CG 50, requiring the use
of --fx or --cg to specify the target machine with -i. The default
is set to --fx to maintain compatibility with older Makefiles.
