Update casadi3 branch references to master
The casadi3 branch was the point of main development, and has now replaced master. The latter has been renamed/moved to maintenance/2.0.x. Any references to the casadi3 branch in the code (code coverage, badges) have now been update to point to master. Note that the actual renaming of casadi3 to master was a "simple" force push, and not a merge commit. This is because development had diverged for too long, and no active development was happening on the "old" master anyway.
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