Squashed commit of the following:

commit a9c3712c
Author: Markus <markus@muc.ccc.de>
Date:   Sat Aug 24 01:29:03 2019 +0000

    Code formatting

commit b69c586c
Author: Markus <markus@muc.ccc.de>
Date:   Fri Aug 23 23:15:15 2019 +0000

    Remove unused variable

commit a83ff3c0
Author: Markus <markus@muc.ccc.de>
Date:   Fri Aug 23 23:06:04 2019 +0000

    Make time setting more appealing

commit 46981523
Author: Markus <markus@muc.ccc.de>
Date:   Fri Aug 23 23:01:25 2019 +0000

    Add wait time to loop

commit 6b58b587
Author: Markus <markus@muc.ccc.de>
Date:   Fri Aug 23 22:56:40 2019 +0000

    Give user time to release button

commit 823c00a7
Author: Markus <markus@muc.ccc.de>
Date:   Fri Aug 23 22:44:48 2019 +0000

    Add option to set time

commit 927d3057
Author: Markus <markus@muc.ccc.de>
Date:   Fri Aug 23 22:44:25 2019 +0000

    Remove obsolete lines

commit e2dbfe81
Author: Markus <markus@muc.ccc.de>
Date:   Fri Aug 23 21:37:42 2019 +0000

    Model localtime as parameter to update function

commit ad560d6c
Author: Markus <markus@muc.ccc.de>
Date:   Fri Aug 23 21:29:09 2019 +0000

    Remove obsolete drawImage()

commit 018f911b
Author: Markus <markus@muc.ccc.de>
Date:   Fri Aug 23 21:28:04 2019 +0000

    Fix button_pressed

commit d9b5e26a
Author: Markus <markus@muc.ccc.de>
Date:   Fri Aug 23 21:17:19 2019 +0000

    Remove obsolete Time dummy class