Enhancement: Inclusion of "dry-run" flag

[MakeItGreatAgain]

A dry-run option could be applicable to functions such as pktwallet wallet creation, and pktctl RPC calls such as sendtoaddress, sendfrom, etc, so the effect of the call can be safely evaluated before execution.

[MakeItGreatAgain]

In the case where a dry-run transaction would fail, the appropriate exit levels should be raised by pktd/pktwallet/pktctl to be indicative of the expected failure, which would be useful in the cases of scripting and automation.