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When the 2017 Blockly update was done, it used isRenderingOn to
determine when to position and render the blocks. This was to optimize
the interaction between the load/upgrade process and workspace
resizes. However, in rare instances it seems to result in blocks not
being placed correctly.

This change removes the special handling of upgrading. Instead, it
disables and enables the Blockly event system during a load/upgrade
operation. At the end of the upgrade process (if needed), it will also
force a save of the blocks workspace.

Fixes #1071

Change-Id: I6bec41dd67bc6371e794e93850ea1455b9acf8c7