Merge branch '78-improve-corner-annotator' into 'master'

Issue #78: Add functions to set text on each corner of screen.

Closes #78

See merge request !30
7 jobs for 79-remove-installer-stage-in-gitlab-ci in 13 minutes and 2 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Build
passed #20316
gui shared-linux
build docs

00:01:08

passed #20317
gui shared-linux
build linux installer

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passed #20318
gui shared-mac
build mac installer

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passed #20319
gui shared-win
build windows installer

00:04:34

 
  Test
passed #20320
gui shared-linux
test Linux

00:02:29

93.0%
passed #20321
gui shared-mac
test macOS

00:01:18

passed #20322
gui shared-win
test Windows

00:08:27