digital: Add MSK/CPM blocks.
digital: Added SWIG bindings for MSK blocks. Fixed (G)MSK correlator.
digital: Really fix MSK correlator, and make it work for non-integer SPS.
digital: Fix warnings.
digital: Remove debug output from MSK correlator
digital: Fix the MSK timing recovery tag processing. Clean up timing recovery
block. Documentation for all CPM/MSK blocks.
digital: Make MSK correlator accept binary symbols. Move blocks to
synchronizers_blk.