PledgeBank: Implement New Pledge wizard for adding pledges

Wizard is made of three steps:

• "Pledge Settings" screen
• "Pledge location" screen
• "Tell a Friend" screen

=== "Pledge Settings" screen

First five fields will define pledge text itself.
(creator_name) will (creator_pledge_desc), but only if (signers_limit) (signer_description_text) will (signer_pledge_desc).

• Group: "Pledge text"
  o creator_name - input text, defaulted to: "I", validated on max length (64 characters), required
  o creator_pledge_desc - input text, validated on max length (256 characters), required
  o signers_limit - input text, validated on integer value, required
  o signer_description_text - input text, validated on max length (128 characters), required
  o signer_pledge_desc - input text, validated on max length (256 characters), required
• deadline: Pledge deadline: date selector, required
• description: Pledge detailed information: rich text field, no validation
• creator_description: Pledge owner's description: input text, validated on max length (256 characters)
• is_active: Is this Pledge active?: checkbox

=== "Pledge location" screen

This screens allows to define optional geographical location of the pledge:

• Does this pledge have location?: checkbox, if set to true, reveals a location form containing fields:
  o City
  o Zip / Postal Code -
  o Enter optional 'add-on' code after the dash ('plus 4' code for U.S. addresses).
  o Country
  o State / Province
  o Latitude, Longitude

=== "Tell a Friend" screen

Exactly as in CiviEvent wizard.