This requires Qt 5.9 (to calculate overshoot).
The default scroll behaviour of list views has far too much inertia.
This should make scrolling feel more like scrolling the other scroll
areas of nheko.

Apparently the nlohmann library is not available in the standard
repositories.  I would rather build it than add universe deps.

Update JSON build dependencies, change the dockerfile and other
CI files that relate to this.  Also update target mtxclient
revision.

- Update version numbers and documentation
- Fix github releases oauth key

Update .travis.yaml to have updated bintray api keys
Update bintray-release.json to have correct casing for repo

status to nheko-reborn matrix room

projects.

Update the appveyor configuration to no longer use mujx keys.

Travis-CI keys still need to be updated.

errors