Adding variable references should re-generate code

[vchelaru]

1. Create a project that auto-generates code on property change
2. Add a colored rectangle to a screen, verify that the code for the colored rectangle is generated
3. Verify that you are using "Generate Automatically on Property Change"
4. Create a variable reference to another component - this should update the color values on the colored rectangle

Observe - the .cs file hasn't regenerated
Expected - changing variable references should re-generate the code

Additional info - I suspect this is because there's an event that is raised for plugins whenever a Variable changes but not when a VariableList changes. Either that, or the color values haven't yet propagated. Investigate, and fix. Explicitly re-generating results in the variables properly being saved.

[vchelaru]

Fixed by 382000f