Update Ignore rule wildcard parsing to match upstream

Merged upstream pull request #415 changed away from QRegExp's ::Wildcard mode to a new format that vaguely matches the ::WildcardUnix mode, but with ; splitting. This was done as part of a massive caching/cleanup pull request that also added the ability to escape wildcard characters and to escape the ! inversion character for regular expression matching.

There's unit tests in expressionmatchtest.cpp and a lot of documentation on the pull request itself and in the expressionmatch.cpp class implementation.