Update plugin so that it compiles with CC 2.12 (!8) · Requêtes de fusion · Ronan COLLIER / PTRANS

Daniel Girardeau-Montaut a demandé de fusionner update_2.12 vers master sept. 09, 2020

CMake script and plugin structure slightly updated so that it can be compiled with CloudCompare 2.12+

Update plugin so that it compiles with CC 2.12