Drop dependency on a DEL in the state chains

This makes the whole thing work in CoreText 5.0 apparently.
It also makes it more sane; the 'lcar' even unneeded.
Building state chains with the DEL class was a fishy idea anyway.
Swap the kern around the space

It seems that Safari won't kern a word into the preceding space glyph.
Still kerns the space itself backwards, so just do the swap.
Move the fake tracking into a separate subtable
Tighten up glyph ranges in the 'kern' table