SUS-2380 SUS-2379 Creation of Shapes Plugin and implementation of best fit Line
This merge request regroups the initial development of the Shapes plugin for Surveypad and the implementation of the computation of best fit lines.
See also merge request for SurveyPad: apc/susofts/interfaces/SurveyPad!101
See Jira Ticket https://its.cern.ch/jira/browse/SUS-2380 and https://its.cern.ch/jira/browse/SUS-2379
Edited by Benjamin Weyer