loci: remove most type_maps code

These functions were only used by the old validator.
loci: remove unused util functions
loci: remove setup_from_add declarations

These functions were removed recently.
loci: remove declarations for nonexistent length functions
loci: remove OXM_INDEX bits

These were only used by the test suite.
loci: remove unused bit-counting macro
loci: remove OF 1.0 IP mask map

This is not used anymore.
Merge into master from pull request #261:
Remove more dead code from LOCI (https://github.com/floodlight/loxigen/pull/261)