Version 0.0.9.4 RC3

This is the last candidate before the release, with the following bugfixes on top of RC2:

• (#573) Resend and Discard buttons work again (thanks to @krkk)
• (#566) A crash upon logout has been fixed (thanks to @aaronraimist for very informative stackdumps)
• (#577) A confirmation to continue use an unstable version is only displayed now to those who can upgrade rooms
• Zeroing the animations duration no more leads to artifacts from incomplete animations
• (#532) Expired access tokens are now processed gracefully, with a prompt to re-login
• (#564) Hitting Tab in the "Add tags" dialog switches focus as proper instead of entering a tab character

libQMatrixClient 0.5.1.2 is recommended, 0.5.1 or later is compatible.