Add support for textarea rendering option for String property type

[sfdc-kho]

Plugins should be able to tell the UI how to render a given property. This should be done by exposing rendering options on properties and allowing them to be controlled via annotations.

Example:

@TextArea
@PluginProperty(name="foo")
protected String fooProperty;

Would end up being rendered as a text area. This concept can be expanded in the future to allow plugins finer control over exactly how they present input controls to the user.

[buildhive]

DTO Labs » rundeck #97 FAILURE
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[gschueler]

thanks for the pull req, i'll check this out asap

[gschueler]

FYI, the merge looks good. I'm adding some changes to Notification plugins to adopt the multi-line feature and then I'll merge it