Bug 11911 – Add Unicode correct case-insensitive variations of string functions

The naming scheme can change but this is the list I've gathered from looking at Boost's string algorithms library (full comparison spreadsheet here http://goo.gl/Wmotu4). istartsWith() iendsWith() icanFind() ifind() ireplaceFirst() ireplaceSlice() We already have cmp() and icmp() so maybe leave those two alone and add new functions to be used for lexicographical sorting. I've only included variations for the functions we already have here. There will be a separate issue for the functions in the linked spreadsheet that are missing entirely (both normal and case-insensitive) in the linked spreadsheet. These all depend on the implementation of the Unicode Collation Algorithm (UCA) (see issue #10566).

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