MATRIC Release candidate (beta 1.50.11)

We're VERY close to official release, 1.50.11 is the release candidate, if no issues pop up it will be released to "stable" channel. Hooray!

Many thanks to all community members that helped us by reporting issues.

Change log:

• Fixed - can not set deck Author nickname
• Hide button resize handles when making screenshots
• Button resize handles much more visible
• Fixed setting page background was always setting the background of first page
• Improved auto deck switcher performance