fixes #507

This reverts commit 74e32dd9.

Sadly still required for replies, otherwise this would be perfect.

Make Text element a sibling of the Rectangle to avoid the text from depending on the rectangle's opacity property. Switch to Nheko theme colors

This disables color emojis for now in filenames

Limiting improves readability on wide monitors.

The immediate update of the settings is done by just exposing settings
as properties and then setting the settings as a context property.