Separate yparser

This is an attempt to unloop the library dependency loop.

1. libknot-int is now standalone library and no symbols from libknot are used.
2. libknot depends on libknot-int
3. libknot-yparser depends on libknot and libknot-int

@dsalzman and @jvcelak please review.

As a side note - I think there should be a libknot/libknot.h that would be enough to include in any project using libknot, dtto for libdnssec...

Edit: there is libknot/libknot.h, it's just not used that much...

Added 1 new commit:

• 351405cf - Use headers from libknot/yparser and not from libknot/internal/yparser

Added 1 new commit:

• 8dd1a461 - Use libknot/libknot.h instead of libknot/errcode.h outside libknot library

Added 1 new commit:

• 5685d03f - tests: fix yparser includes

Added 1 new commit:

• a123ad29 - nameserver: fix include

mentioned in commit 73744ae1

Status changed to merged