Edited semantic.json components list

[skwny]

Alphabetized the list and removed duplicate "form" string.

I find myself constantly referring to this list to determine which components are necessary to implement something from the library.

It would be useful to eventually have a 'dependencies' list on each component's docs, which states what other components are needed to implement the component being examined.

[jlukic]

It is currently grouped alphabetically by component type, which helps me