2.9.0: Realm Browser UI improvements and fix for the auto updater

Changes since v2.8.0

Enhancements

• Added an option to hide system classes from the Realm Browser. #925
• Improved the UI for selecting classes in the Realm Browser. #933.
• The window size, position, and maximized state are persisted and restored the next time a window of the same type is opened. #934
• Improved the UI of the grid displaying data in the Realm Browser. #941

Bugfixes

• Fixed an issue that could cause the sidebar to take a lot of space when the window is resized. #924
• Flipped the direction of the arrow on right-positioned sidebars. #924
• Fixed an issue that would prevent Studio from automatically updating to a newer version #929