AuraSkills Compatibility (#447)
* AuraSkills Compatibility
* enum value and skill level validators
* conversion to MapTags
* extensions
* "valid" variable naming convention
* `auraskills_experience` tag and mechanism
* ``@example`s and shortened skill check
* meta clarification and player instance stored
* remove `asDouble` and `asInt` in mechanism error
* removed static method, stores experience amount to reduce needing to be grabbed repeatedly
* naming uniformity
* plugin.yml update
* map entries instead of every skill
* minor condition change
* minor changes
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commit: dee5375)
