Add include option

[pjanotti]

Fixes #163.

Assuming that users typically won't be using both, if they do exclude filter takes precedence. Notice the defaults:

• Default exclude: nothing is excluded
• Default include: everything is included

I felt tempted to avoid some allocations on the filters but opted to keep the code clear as it is, e.g.: I could have avoid some string allocations by batching the creation of substrings etc. Perhaps we can look at this later as separate optimization.

For the tests the include filters are almost symmetrical to the exclude ones so I put some of them under the same test method.

[tonerdo]

Thanks for the contribution @pjanotti, will take a look later today

I felt tempted to avoid some allocations on the filters but opted to keep the code clear as it is, e.g.: I could have avoid some string allocations by batching the creation of substrings etc. Perhaps we can look at this later as separate optimization.

I'm definitely open to whatever perf optimizations you have in mind

[tonerdo]

Merging this

[pjanotti]

Thanks @tonerdo. The bit about the optimization is a bit "premature" in the sense that I see that we could avoid some allocations but that shouldn't be the issue with better ROI. Hopefully I will have some time to find better targets by collecting some performance profiles.