Updated for compilation with multiple g++ and C++20 while resolving e…

[dt1729]

Updated for compilation with multiple g++ and C++20 while resolving error in MARMaxPolicy.cpp for ranges_ vector

elementary edits for compilation on ubuntu 20.04 with multiple g++ installations and 9.4.0 set as default, this causes an error in MARMaxPolicy.cpp for ranges_ vector where iterating using (auto r : ranges_) is not feasible for some reason.

[Svalorzen]

Hey, sorry for the late reply.

I don't really see why this change makes sense for the project. If you have multiple g++ installed, there's no need to force g++-10 as the compiler (which might not even be installed if one has a newer version). Instead, you can generally pass such values as environmental variables to cmake.

As for the for loop change, the culprit is again a compiler that is too old, so I don't think it's worth changing (especially now that some time has passed).

[dt1729]

I believe at the time I was working on my primary ROS development machine. That particular compiler worked for most of my projects so I had to make it work for this library. Forced change for this library and definitely not a bug.