Separate options to disable editor-mode selecting and dragging individually

[towerofnix]

(Separate tracking issue for now-resolved #2380, see https://github.com/ScratchAddons/ScratchAddons/issues/2380#issuecomment-913292558.)

The "Non-draggable sprites in editor" addon is a convenient way to preview how a Scratch project will actually behave when viewed on the player page. Its behavior has two distinct parts:

1. Disable editor-style sprite dragging. (Note sprites which have been specifically made draggable may still be dragged, in the distinct editor-style.)
2. Disable selecting sprites by double clicking.

For completeness and general use, these should be made into separate toggleable options, instead of making all users of the addon use both features.

[CST1229]

Maybe also add an option to have dragging for all sprites, but to not select the sprite when dragging is complete,

[towerofnix]

Agreed @CST1229! I forgot about that behavior. The options could be:

• Disable dragging sprites in editor
• Disable selecting sprites after double click
• Disable selecting sprites after drag