enhance ruler tool: store measurements somewhere
Created by: katjaq
Currently, the ruler tool works like this: 1 you select the ruler tool 2 you click in the location from where you would like to start measuring, than you click in a second location (and maybe a 3rd, 4th and so on – as long as you do still want to add points to your pathway). 3 Once you have clicked the final point, you hit the return key and the distance between point1 and the final point will be displayed inside the user chat window.
Idea: Instead of only sending the distance to be displayed in the chat window and being lost once you go to another page (like from MRI page to project page to go to the next brain for instance...), we would like to
- have a third type of annotation: type 'number'. (in addition to annotation type 'volume' and 'text') So that a user could go to the project settings (e.g. in this project, and click the plus button at the bottom right of the 'Annotations' table to add an annotation, for example we could imagine to add Name: 'width of corpus callosum', type: 'number', value: 'ruler tool'

- once this would be in place, the user could go to the project , e.g. here and click into the new column 'Width CC' for one subject, and then use the ruler tool to click two (or more points) that on return key will send the measurement directly into the previously chosen 'Width CC' field of the subject.