POC for #75

[jhart-r7]

Right now this is just a POC for the second proposed solution in #75. Basically I am proposing that we do away with the flags attribute entirely and utilize special grouping or non-grouping constructs as necessary to provide equivalent functionality. So, for example instead of pattern="foo" flags="REG_ICASE", we will use pattern="(?i:foo)".

There are basically 3 parts to this PR:

1. Write a utility to convert only affected fingerprints to the new format
2. Convert the existing XML fingerprint files
3. Remove all code related to parsing of flags

To merge this, at a minimum we'd need to bump to 3.x and any projects that utilize recog will need to ensure that their usage of the Recog content properly handles these new regular expressions.

[jhart-r7]

Closing for now.