Merge branch '243_add_close_button_to_assetwidget' into 'master'

Add button to allow closing the current editor

Closes #243

See merge request !147
5 jobs for master in 13 minutes and 23 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Build
passed build_linux_36 #205965
docker

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passed build_linux_37 #205966
docker

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passed build_macosx_36 #205963
macosx

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passed build_macosx_37 #205964
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  Deploy
passed deploy_beta #205967
docker

00:01:27