Improve user experience

[rturrado]

libqasm's equivalent to this OpenQL issue.

Current build line looks something like:

conan build . -s:h compiler.cppstd=20 -s:h libqasm/*:build_type=Release -o libqasm/*:build_tests=True -o openql/*:compat=False -b missing

As a result of the conversation for this issue that I opened, I've found out that we could turn it into something like:

conan build . -pr=conan/profiles/tests-release -b missing

Explanation (see also here):

1. If you set CMAKE_CXX_STANDARD in your project, you don't need to pass the compiler version as a command line parameter. I've noticed we were not doing that in OpenQL.
2. There is a way of not working with command line options at all, but defining them in a profile. For example, we could provide a conan/profiles folder together with the code, including a set of predefined profiles, e.g. tests-release, which would look something like:

include(default)

[settings]
libqasm/*:build_type=Release
[options]
libqasm/*:asan_enabled=False
libqasm/*:build_tests=True
libqasm/*:compat=False

And then just compile with conan build . -pr=conan/profiles/tests-release.

Or, these profiles may be copied to the ~./conan2/profiles folder, e.g. for this case, with a name such as libqasm-tests-release, and then build with conan build . -pr=libqasm-tests-release.

[rturrado]

This should be fixed now by this commit.