wxgui: CPack fix

* CPack wasn't including most wxgui files in Windows packages
* Making CPack component registration consistent with other modules fixes problem
blocks: address CID 1043279. Remove member d_count (of keep_m_in_n) that wasn't being used.
blocks: address CID 1043280. An unused member (of endian_swap) had the same name as parameter. Removed member.
digital: address CID 1043273. Unused d_verbose member (of clock_recovery_mm_ff) and setter were unused.