Threads implementation - Githubissues

[x] Can reply to any entry
[x] Can click on the brand new « view thread » and « view replies » on entries to see them in the context of the thread
[x] Added a « show thread » filter near the previously implemented « show favorites » filter
[x] is:thread and is:reply search operators
[x] Adjusted deletion logic to support deleting whole thread at once
[x] Minor UX improvements: faster UI refresh during updates/deletion
[x] Documentation for the whole thing

agateblue / tempo