Fixes #10731 - Allow matches to merge with default values

fixes #10232 - moving validations and casting out of lookup key and value

Refs #3809 - Enable cop Style/IfUnlessModifier

Fixes #10409 - Rails 4 compatible changes with Rails 3

Fixes #8333 - correct matcher values with multi-key matchers

Fixes #9787 - correctly typecast default values

JSON and YAML default values were double typecasted, once by active
record and then by value_of_key method.

Fixes #9673 - treat YAML and JSON lookup keys as strings

Refs #3809 - Remove cops for empty lines

Fixes #8052 - allows erb in array and hash params

Fixes #8551 - use most specific matcher for inherited hostgroups

Host recieves correct smart_class_parameter value when multiple overrides for
inherited host groups exist for parameter.

Fixes #3260- Allows puppet to manage value of smart class parameter that can be overrided

Fixes #3309 - Support deep merging of hash and array structures in smart class parameters

Refs #3809 - Use parentheses in method definitions

Refs #3809 - Fix a few rubocop TODOs

fixes #7163 - on host's edit page, show the source for the value of puppet class parameters.

fixes #5246 - remove second host/class lookup impl so config groups are included in ENC output

fixes #5105 - remove Setting['remove_classes_not_in_environment']

fixes #2260 Allow ERB in ENC global / class parameters

Adds code to parse the global & class parameters, and adds a setting (default true)
to disable this if needed. Also has some tests.

fixes #2411 - move files in /models to /concerns, /services, /mailers, /observers