Add qdsync_cccf_create_cpfsk (#417)

[asazernik]

No description provided.

[jgaeddert]

Your first commit will cause major issues; removing the call to execute will violate the timing synchronization of the receiver. The way the synchronizer works is that it looks for a known preamble using qdetector, then corrects the timing/carrier/gain offsets from these samples and invokes the callback on the resulting symbols. Because synchronization can happen at any time offset, it's impossible to know what the state of this input buffer is in. The qdetector returns a pointer to the aligned samlples that qdsync needs. Technically yes, it is a recursive call, but only one level deep.

The second commit is perfectly fine. I can try to merge this in, but will have to suppress the first commit.

[asazernik]

I'll update the pull request to remove that commit.

[asazernik]

Now it just contains "Add qdsync_cccf_create_cpfsk (#417)"