Fix Dash copyright violations!
Motivation
Replacing any copyright headers that were formerly Dash with Crown is a violation of copyright and a liability to Crown project.
See here for an example of how MIT licensing requires it to be done: https://github.com/PIVX-Project/PIVX/blob/master/COPYING. Now take a look at the same Crown file: https://github.com/Crowndev/crowncoin/blob/master/COPYING
Suggestion
Dash copyright must be present. Fix the COPYING file and all the sources merged from Dash.
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