Allow switches between filemode and interactive mode in QASM prompt executable

[maloleroy]

Is your feature request related to a problem?
Currently, it is only possible to execute the program in interactive mode or in file-reading mode, not a mix of both.

Proposed solution
If the file test.qasm contains the following

qubit a;
h a;
@interactive;
@display;

The first two lines should be executed, then we should switch to interactive mode until a quit or exit command is entered, and resume to the last @display; line.

Additional context

• Should probably add a @quit; run statement for consistency