Release notes for 506

Add APIs to override built-in terrain material appearance.

Logpoints now log the script name and line number where they are placed. They are also clickable, bringing them to feature parity with print-based debugging.

Assets by verified creators have a visual indicator in Toolbox.

Added an Explorer context menu item to enable/disable Script and LocalScript instances under the selection.

Removed private header file of UpdateNotification in ShareModalWindow.cpp

Mutually recursive types must agree on their type parameters. (This restriction always existed, but caused random behavior if it was broken).

Improved type inference for tables with an explicit type.

Fixed various crashes in physics APIs.

Fixed a bug where welding a part to a floor where a character was standing could cause the character to start falling for one frame.

With this change, when Scripts are edited during a debugging session, the breakpoints don't lose their conditions, log expressions and other properties.

1. Fixed undo/redo when creating/removing/renaming attributes in the properties panel.
2. Made internal update also track property descriptors instead of instances to fix the dev form problem: https://devforum.roblox.com/t/properties-widget-attributes-behave-badly-with-changehistoryservice/1343162