use base16 for token id encoding in config files #179;

[greenhat]

Close #179

[coveralls]

Pull Request Test Coverage Report for Build 3573929270

• 4 of 6 (66.67%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.05%) to 64.954%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
core/src/serde.rs	4	6	66.67%
<!--	Total:	4	6	66.67%	-->

Totals
Change from base Build 3573799842:	-0.05%
Covered Lines:	1985
Relevant Lines:	3056

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💛 - Coveralls