added a button to dynamically filter crowns

Author git <vivec@telvanni.eu>
Author date 2019-06-02 15:38:58
Author local date 2019-06-02 17:38:58 +0200
Committer git <vivec@telvanni.eu>
Committer date 2019-06-02 15:38:58
Committer local date 2019-06-02 17:38:58 +0200
Commit 39920317a9096e2f790981dbcd49bc5f3f97d7fa
Tree f0753a478a094bff51eab1623e2a01925422d8ea
Parent 005b3b59fd802057d21a06be5a79661dbbc50d7c
added a button to dynamically filter crowns