lost & found search

[DerGernTod]

create a search based on http://katzensuche.streunerkatzen.org/index.php?option=com_sobi2&sobi2Task=search&Itemid=55

• make filters like searchable tags (listbox) #41
• use great loading spinner: https://codepen.io/tkain/pen/dNQzYb
• provide list view of results

[DerGernTod]

current obstacles:

• [x] styling
• [x] history popstate is triggered upon each link click (e.g. anchor change), causing xhrs to be sent, updating the search results incorrectly
• [x] cms dropdowns in cats don't represent actual value