ARIA-149 Enhance operation configuration

ARIA-149 Enhance operation configuration

* Also fixes ARIA-121, ARIA-190
* Parse special "dependencies" configuration parameters as YAML and
  treat as Parameter models, allowing them full use of intrinsic
  functions, type coersions, and validations
* Rename various functions that process "properties" to more generically
  process "parameters" (properties, inputs, attributes, arguments, etc.)
* The "configuration" field in OperationTemplate and Operation models
  is now now a dict of Parameter models
* Add "function" and "arguments" fields to Operation model to preserve
  user data (in "implementation" and "inputs") and to clearly demarcate
  orchestration data from user data; update task API accordingly
* Some cleanup of parser code touched by this commit
* Rename "create_parameters" to "merge_parameter_values" and improve