tiny-regex-mod

Single file modification of tiny-regex-c by Kokke

Adds a few features and removes some minor issues:

made it into a single file library
modified to return a pointer to the start of the match (instead of an integer)
added option to get a pointer to the end of the match
removed static use of regex object
added quantifier operator {m,n} (also {m}, {m,})
added lazy quantifiers ??, *?, +? and {m,n}?
merged quantifier (?,*,+,{}) matching into two function (one for greedy, one for lazy)
added upper limits to quantifiers
(hopefully) fixed class range matching
(hopefully) fixed handling of escaped characters
(hopefully) fixed . matching (doesn't match \r or \n)
probably butchered print functionality

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