`<Label>`s should be escaped by default

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Labels on EZOut property names are used pervasively within the module.

However, there are a pair of problems with this:

1. Labels are not escaped, so property names that would be illegal in XML are not supported.
2. Labels are only provided in VirtualProperty/AliasProperty scenarios (because the engine does not technically require them otherwise)

The second problem is one part of why #235 manifested.

The solution to both scenarios is to escape labels where they are found, and always provide a default.