Add negation to Filters

[pablomayobre]

The idea is that Pool Filters should be able to reject an Entity if it has a given Component.

I already have this working in a00ee08

[HDictus]

Hi Pablo, I've been enjoying this feature. Can I ask why you haven't made a pull request into the main Concord repo with this?

[pablomayobre]

This feature exists in the dev branch and also in the experimental branch.

Right now I want people to test and try to find bugs in the experimental branch so that I can confirm that the code is proof tested, and ready to be merged into dev. Once that's ready I would love to have up to date documentation, and once we have that, then it can move into master and 4.0 can be released.

Right now dev is usable, without major bugs or errors, just lacking up-to-date documentation. While experimental can have bugs or errors and lacks far more documentation.