Allow custom regex in Build Warning Parser

To be able to support all kind of tools it would be convenient if the Build Warning Parser would allow a custom regex to capture the information.

This is quite common to support, for example VSCode and Qt Creator has options like this to integrate well with custom tools.

This is for example how it looks in Qt Creator:

Something similar could be integrate into the build warning parser task.

A regex together with capture positions for the different data.