Figure scripts: update for recent toolbox changes and check they all run #60

Likely smell: the figure scripts in figures/code probably need updating for recent RTB, MVTB and spatialmath changes, and some may no longer run (fig6_26 and fig6_27 use laser=, which is now lidar=). The notebook and plotting recipe is in rvc-ecosystem notebooks.md. Please run every figure script and fix what you find. See also #55 and PR #59.