Background reload does not update actor background xy limit until restart.

[RichardULZ]

Describe the bug
Updating a Backgrounds Dimensions will not update actor xy limits until an editor restart.

To Reproduce
Steps to reproduce the behavior:

1. Place an actor on a small background
2. Change the backgrounds size to larger in any dimension(s) and save
3. Try to move the actor into the new empty space.
4. Actors limited to the old xy dimensions.

Expected behavior
Auto or manual asset reload updates the background xy limits for actors in a scene.

Screenshots
If applicable, add screenshots to help explain your problem.

Platform (please complete the following information):

• OS: [Windows 10]
• App version [1.2.1 / latest dev branch]

Additional context
Collisions are cleared, so at least some areas get the new dimensions.
Another issue related to missing images causing a crash could complicate how this is fixed.

[RichardULZ]

This appears to be fixed in GBStudio 2.0 Beta2! Woo!
(another bug similar to this now exists for changing a scenes background from the editor drop down. #559 )