Add ability to extend Form
Support the concept of form ID
Clear/hide field errors on blur

And allow for @context to add context to the bare string literal. For
instance,

    /* @trans, @context "noun" */ 'Open'

Would mark the string 'Open' translatable with context "noun".

The software defines at least three contexts for the phrase "Open"

  * The name of a ticket queue (Open tickets)
  * A status of a ticket (Open / Closed)
  * An action to be performed (Open a ticket)

References:
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http://i18n.osticket.com/translate/osticket-official/148/enus-de#2915

Allow for type and encoding specification of the message body and better
describe the integration with custom form fields.

Allow `streams.cfg` to be implied as 'core', which will default to only
upgrading the core osTicket stream.

Use signature to describe snapshots rather than md5

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