Alternative TagList implementation that is case preserving, but case insensitive for matches

[aricart]

[RETRACT] 2.7.0/2.7.1

[CHANGE] tag list is case-preserving but case-insensitive for matches
[FEAT] added FilterTag() to filter a set of entries by the tag name (tag name is considered case-insensitive)
[FEAT] added TagValueFor() to return all values matching a particular tag name (tag name is considered case-insensitive)

[coveralls]

Pull Request Test Coverage Report for Build 11168761683

Details

• 56 of 71 (78.87%) changed or added relevant lines in 1 file are covered.
• 3 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.1%) to 81.103%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
v2/types.go	56	71	78.87%

Files with Coverage Reduction	New Missed Lines	%
v2/types.go	3	86.69%

Totals
Change from base Build 10906299209:	0.1%
Covered Lines:	2794
Relevant Lines:	3445

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💛 - Coveralls