Add picosha.hpp to verifier.hpp

[emlowe]

verifier.hpp uses picosha2 but didn't include it, which seemed strange and required everywhere you used verifier.hpp to have also to include picosha2.hpp. This seems backwards.

Adjust verifier.hpp to include picosha2.hpp and remove now unneeded reference from other source files.

[coveralls-official]

Pull Request Test Coverage Report for Build 11601629103

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 79.028%

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Totals
Change from base Build 11599391321:	0.0%
Covered Lines:	3497
Relevant Lines:	4425

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💛 - Coveralls