Generates bad enum constant if enum value is all punctuation

[mgabeler-lee-6rs]

Given a field like:

				"logic": {
					"type": "string",
					"enum": ["<", "<=", "==", "!=", ">", ">="]
				},

The generated code looks something like:

const Logic Logic = "=="
const Logic Logic = "!="
const Logic Logic = ">"
const Logic Logic = "<"
const Logic Logic = ">="
const Logic Logic = "<="

which is obviously invalid.

It looks like Caser.Identifierize needs handling for the case when the initially computed identifier is the same as the type name, and schemaGenerator.makeEnumType might also need some handling if multiple enum values map to the same constant name, to append _1,_2 etc or some other disambiguator.