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Add peer protection capability (implementation)

Also slightly reworked the loop that selects candidates to prune to make
it better behaved. Before, if we needed to prune N connections, we
preselected N and ended up doing nothing if they happened to be in the
grace period. Now we skip over them and prune ungraced connections until
we meet our target.

Users can call Protect() to save a peer from pruning, and Unprotect() to
remove the protection. Protected peers don't count towards the target
quantity to prune during a connection manager cycle.

add gomod support // tag v0.0.1.

gx publish 0.3.34

gx publish 0.3.30

gx publish 0.3.29

Fix concurrency and silence period not being honoured

gx publish 0.3.27

Improve Test Coverage

Add docs to BasicConnMgr