Cleanups after removing generated/properties

[domenic]

Followups after #278:

• Rename each handler's description export to descriptor or propertyDescriptor, for clarity.
• Rename getPropertyDescriptor() to createGenericPropertyDescriptor() for clarity, and add documentation explaining how it is used when we don't have handler code.
• Reduce the size of the package (as seen by npm pack). Either implement Reduce the amount of work done to assemble a list of all properties #279, or:
  • Remove lib/utils/allExtraProperties.js. It is only used by prepare scripts.
  • Remove lib/generated/allProperties.js. It is only used by prepare scripts.

[asamuzaK]

Add this to the list too:

• Remove unnecessary globalObject argument passing to parsers functions, e.g. parsers.parsePropertyValue(value, { globalObject: this._global }).
  Need to fix:
  • lib/normalize.js
  • lib/properties/*.js
  • lib/utils/propertyDescriptor.js

[domenic]

Let me know if we should do a major release now, or do some more cleanups first, or...

[asamuzaK]

Cleanups first.