WIP: begin adding Twitter social network adaptors

Stage one: create Twitter SNI adaptor
    - almost complete
Stage two: create Twitter content item subtypes
    - not started
Stage three: create Twitter filters/sorters
    - not started
Stage four: write tests
    - not started
Initial work on Twitter

Relayout of tools
Test twitter app with pin based auth
Added fixes for Qt5
More work on twitter test
Initial work on TI
More work
More work
Post merge fixes
Don't use int in pin

Otherwise 0123456 is gonna fail ...
More work
Post rebase fix
More post merge fixes
Once more
TI mostly finished, added support for loading followers / followee