[refact] Use URL instead of GIT to download projects
Changes:
- Uses URL instead of GIT for all projects
- Update PCL to 1.14.1
- Update FLANN to 1.9.2
- Update GTSAM to 4.2
- Remove forks for PCL, GTSAM & Teaserpp
- Fix issue with c++17 & eigen in the slam (see 3997830a)
Fixes #18 (closed)
Edited by Timothée Couble