iOS 13: Dark mode: Force specific mode

I would be interesting to have a setting to force a specific theme mode.

We could have for example, three settings such as:

• Light
• Dark
• System

changed milestone to %3.2.1

added Minor + 1 deleted label

added Feature label and removed Minor label

assigned to @edrflt

closed via commit 93b539f8

mentioned in issue #688 (closed)

mentioned in issue #913 (closed)