Manager Idea: Block Settings

[jbrozek]

When creating a block it would be helpful to be able to group some of the fields in an alternative area for the block, something similar to settings of a page. So we could do the following (stealing concepts from regions).

[Field(Title = "Style Css", Display = BlockDisplayMode.Setting)]
public StringField StyleCss { get; set; }

Therefore fields that are rarely used but still need to exist could be represented by a gear icon (next to collapse, drag handle and delete) could be triggered but not shown in the manager layout.