Add support for profile fields

This is client support for MSC4311, which allows us to (finally) set and
read custom profile fields. I think we should take the approach of only
allowing a small subset, so in line with that I added timezone and
pronouns to the account editor.

These settings are hidden or disabled depending of it's supported or
allowed on your server.

Fixes #661

src/libneochat/CMakeLists.txt

@@ -22,6 +22,7 @@ target_sources(LibNeoChat PRIVATE
     texthandler.cpp
     urlhelper.cpp
     utils.cpp
+    profilefieldshelper.cpp
     enums/messagecomponenttype.h
     enums/messagetype.h
     enums/powerlevel.cpp
@@ -32,6 +33,7 @@ target_sources(LibNeoChat PRIVATE
     events/imagepackevent.cpp
     events/pollevent.cpp
     jobs/neochatgetcommonroomsjob.cpp
+    jobs/neochatprofilefieldjobs.cpp
     models/actionsmodel.cpp
     models/completionmodel.cpp
     models/completionproxymodel.cpp
@@ -44,6 +46,8 @@ target_sources(LibNeoChat PRIVATE
     models/stickermodel.cpp
     models/userfiltermodel.cpp
     models/userlistmodel.cpp
+    models/timezonemodel.cpp
+    models/timezonemodel.h
 )
 
 ecm_add_qml_module(LibNeoChat GENERATE_PLUGIN_SOURCE