Vscode-code-runner: Add include paths for C and C++ automatically

[ranolfi]

Improvement suggestion:

VS Code supports adding include paths to a file c_cpp_properties.json under [dir]/.vscode as an "includePath" array.

Code Runner could pick up these automatically and pass each one to gcc and g++ as arguments to the -I parameter.

Preferably, it would only do this for non-default paths.

[ranolfi]

Figured this wouldn't be so useful without a way to also specify libraries for the linker.

Perhaps Code Runner could save a file under ./.vscode/ like VS Code does, where a list of libraries could be set, either as an array or as direct input to gcc/g++ (as obtained from pkg-config --libs <lib>)?

[He2hiwei]

We need this feature.

[LauritsLL]

We certainly do need this feature!!