CG33 Font patch

I'd been slacking with this thing, really. Back then, I'd written the script to be able to change font on E680/i/g, but the CG33's gone to nowhere. In my previous-released CG33, the script seems to be doing nothing becase the font is just there already.

Recently calie's kindly requested the feature back. So here it is.
AMCSL.TTF is linked to /tmp/AMCSL.TTF, I just like it there rather than on /ezxlocal like chiennk did in the old days. A default font will be used if no new font specified to link to mentioned location.

For E680i->E680g
33_minimal_ig_aep_1.2.smg.a
33_minimal_ig_aep_1.2.smg.b

For A780_AHP
33_minimal_a_ahp_1.1f.smg.a
33_minimal_a_ahp_1.1f.smg.b

For E680
33_minimal_o_aep_1.2.smg.a
33_minimal_o_aep_1.2.smg.b

And here's the font-linking script (if you're lazy enough not to write one)
font.sh
the previous script lacked "voidness" checking :(