Revert "Adds various functions to the Workspace context menu, including collapse/expand"

This reverts commit c56eec8163454ec52817ae9bb48d74e065dd8d17.

Change-Id: I7b879582a90edefb32276fe6f29b12cada88398d
Update to Blockly v958

now includes collapse and expand from Blockly core

Change-Id: I6c43c01fbf77d50933c9f228b80d749f62c3dce0