saskali 5d4f21b89f Add trace filter by category (#71)
* Add trace filter by category

- fixes #39
- fixes #57

* Fix combination of filter types

* Refactor filter

- use idiom 'seq' to check for empty sequences

* Make small refactorings in filter code

* Refactor toggle-category-fn to use set operations
2017-09-14 16:44:44 +02:00
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