Allow presets to be edited before saving

[steveatinfincia]

Right now the preset system is just saving groups of settings at the same time to ensure that a particular feature is configured correctly. It displays the settings in a small box so that people can see what will be changed, but it does not allow them to be edited. In some cases this is ok, in others we may want to make it obvious that a particular setting might need to be changed and allow them to do it right there in the same screen.

Instead of making the text box editable we should use a small ListModel and ListView, and put those specific settings in a list similar to the normal ground pi settings, with proper UI controls and constraints on the possible values.