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 and 'lcar' even redundant.
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 a space glyph before.
Still kerns the space itself backwards, so just do the swap.