Type Mismatching

[lilleyse]

This PR makes the styling language stricter about types and less reliant on JavaScript conventions.

• Removed != and ==
• Added a section about operator rules. Specifies which operators accept which types
• Added a section about string conversions.
• Added the Array type to more areas, I think it was just oversight that it was missing before
• Removed Matrix types from batch table binary - they were never implemented in the shader backend in Cesium and I can't think of a great use case for them anymore

Cesium implementation : CesiumGS/cesium#4860 and CesiumGS/cesium#4940

[pjcozzi]

All looks good, just one question: remind me where arrays are currently used in practice?

[lilleyse]

They are allowed as properties in the batch table json. Otherwise they aren't used for any special purposes.