Sprite Editor Layout Improvements

[RobertBColton]

Same as #156 but for the sprite editor.

• Changes properties layout from vbox to form so it has two columns where that's needed like the name field.
• Adds the name label and a buddy field.
• Maps the name field to the tree node.
• Stretches the x/y origin line edits in the parent grid layout.
• Gives the root widget layout a proper "mainLayout" name.
• Gives the origin group layout a proper "originLayout" name.
• Gives the collision shape group layout a proper "collisionShapeLayout" name.
• Gives the BBox group layout a proper "bboxLayout" name.
• Gives all the labels in the BBox dimensions grid the correct buddy.
• Removes the bottom spacer in the properties layout that was used to push everything to the top since form layout does that automatically.

Master	Pull