Add LITH charge serialization with DTEC

[Ksawi999]

Why?

1. It's faster, easier and takes less space.
2. Forward compatibility - PHOT revamp #884 will probably disable LITH reflection (but only if this PR will be accepted) so this will be the only method of doing that.
3. It wouldn't break any old save (please correct me if I'm wrong). Even if lith is next to the dtec it's in most cases because the phot will bounce off it resulting in the same wavelength.

[jacob1]

I don't think this is necessary. The previous version already added the PHOT reflection method of detecting charge. We don't need another new method of doing it. I'm not entirely happy with the PHOT method either, but for the same reasons as this one, it's not a very "natural" way of detecting it and relies on FILT tech (this one moreso than the PHOT method).

Your other PR hasn't been accepted yet, and also doesn't remove the PHOT method yet anyway.