feat: Easily export attributes

[TekWizely]

Enables two quick ways to export an attribute:

Export with implied variable name based on attribute name

• EXPORT .ATTRIBUTE.NAME
  • Implicitly assigns to variable ATTRIBUTE_NAME, ie
  • Removes leading '.'
  • Replaces remaining '.' characters with '_'

Export with explicit variable name

• EXPORT .ATTRIBUTE.NAME AS VAR_NAME
  • Assigns to variable VAR_NAME

bug: Normalize attribute names in RHS references

TODO:

• [ ] Update Readme

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Fixes #57