Maya: Safer handling of expected render output names

[create-issue-branch]

Feature

This adds better handling of render settings in Maya.

First part concerns Creator:

If render instance is created, based on selected renderer sane default settings are applied to render settings - animation is turned on, exr is set as default format and resolution is set from asset. For vray _ is used as default render element separator.

Todo: this should be extended to be more universal. For example by loading json data from Settings so TD can add/override per projects those renderer settings.

Second part is Validator that must validate all OpenPype required render settings. That could be also extended by json data from Settings, so custom renderer settings can be validated.

Json data should include attribute name and expected value:

{
    "renderer": "vray",
    "attributes": {
         "someNodeType.someAttribute": "value"
    }
}

someNodeType will be used to get actual node (cmds.ls(type="someNodeType")) as render setting nodes can have different names.

closes #1159

[antirotor]

this now include changes in #1504 as it depends on it