v2.0.0-alpha.6

While this is an alpha release, new servers should use this rather than an older "stable" version.

Features:

• Show advance messages in the chat. (#1666)
  Now you can see during which media a message was sent.

Bugfixes:

• Fix history display in Chrome. It used to use float: inline-start, which Chrome does not
  support. Now it uses CSS grids.

Internal:

• Use CSS grids for media lists. (#2148)