Tries to open the font specified by textAttr. If the font has allready
been loaded into memory, it will be opened with OpenFont(). Otherwise
OpenDiskFont() will try to load it from disk.
INPUTS
textAttr
Description of the font to load. If the textAttr->ta_Style
FSF_TAGGED bit is set, it will be treated as a struct TTextAttr.
RESULT
Pointer to a struct TextFont on success, 0 on failure.
NOTES
EXAMPLE
BUGS
Loadseg_AOS() which is internally used to load a font file
from disk, does not handle address relocation for 64 bit CPUs
yet. Will add a hack to support this.