Bump version to 1.10.7

Prepare for next release

Increment version from 1.10.4 to 1.10.5

Set 1.10.4 as the unreleased version

Update changelog for 1.10.3

Add export declarations for AddressLess operator specializations

Missed some succs->successors renaming

Unbump version

Add FIXME about incomplete create-module-without-a-name test

Cmake revert to using ${Protobuf_LIBRARIES}

Instead of protobuf::libprotobuf, which is currently
treated too inconsistently by CMake.
Also remove the exported find_dependency.