#169 Add support for 'omitIgnoredModules'

[Richard]

Checkstyle has an option in it's ant process that allows users to avoid executing modules that have a severity set to ignore. It is called omitIgnoredModules. It has been in checkstyle already for atleast 2 years.
See:
https://github.com/checkstyle/checkstyle/blob/2f3f4b76f04f0b5071abcaed54648a49a0db3160/src/main/java/com/puppycrawl/tools/checkstyle/ant/CheckstyleAntTask.java#L118
https://github.com/checkstyle/checkstyle/blob/2f3f4b76f04f0b5071abcaed54648a49a0db3160/src/main/java/com/puppycrawl/tools/checkstyle/ant/CheckstyleAntTask.java#L424-L428

We are in the process of adding this option to our CLI (https://github.com/checkstyle/checkstyle/issues/3566) and would like to see eclipse-cs support this feature so users can customize it.

Thanks.

[Lars Koedderitzsch]

The eclipse-cs plugin uses this option since when it was introduced many years back, to prevent unnecessary execution of "ignored" modules. Since events with the ignored severity are not reported inside eclipse anywhere it would just be a waste to execute them, hence the option cannot be disabled within the plugin.