z88dk-lib initial commit

[feilipu]

Created an initial structure for z88dk-lib tool support.

zcc +rc2014 -lm -x -clib=new @tms.lst -o tms
zcc +rc2014 -lm -x -clib=sdcc_ix @tms.lst -o tms
zcc +rc2014 -lm -x -clib=sdcc_iy @tms.lst -o tms

What is not done is to customise the individual c wrappers for uint8_t vs uint16_t for SCCZ80.
This is the next job.

But, as is, it should produce the same result as for the stand alone sdcc_iy version.
This result should be checked before further progress.