do not update component when data not changed even if skipTypeChecking

[ngokevin]

Description:

I ran into a bug where updating geometry component using same object where the data did not change was re-creating the geometry. If the data does not change, then the update handler should not run.

Changes proposed:

• Still do component data comparison even if skipTypeChecking is enabled.
• Give selector/selectorAll property types null default value. Because the string was getting resolved to null, the deepEqual comparison for components was false (e.g., oldData.geometry.mergeTo == '') vs. oldData.geometry.mergeTo == null). This can cause components to needlessly update.