Improve UI for eiditing databag properties

[bugzmanov]

Affects: project admins

Background:

• copying databag content from another running genesis server is a pain
• most people are fimilar and comfortable with property file format

In order to impove experience of working with prepared databags genesis should provide UI allowing to manipulate databag properties as sinle multiline edit (memo) with following format:

property.name = property value
property2.name = property value
...

Requirements:
It should be possible to edit/add/delete properties in single multiline edit and then switch to current (with 2 inputs per property) view

Same validation rules and restrictions should be applied to new edit mode as current facilities.
For simplicity reasons: validation error will not point to exact line in multiline edit