add PositionLiteralsFirstInCaseInsensitiveComparisons rule

most of this rule is the same as PositionLiteralsFirstInComparisons
first shot at adding all this stuff
first shot at adding all this stuff
first shot at adding all this stuff
first shot at adding all this stuff
second shot at adding all this stuff
second shot at adding all this stuff
Merge branch 'master' of https://github.com/larrydiamond/pmd
pmd: update changelog with new rule PositionLiteralsFirstInCaseInsensitiveComparisons