Basic interpreter with custom command

I expanded the BASIC script interpreter in to include an example of how you can extend the interpreter and add your own commands to it. Sorry about the Makefile depending on Qt. I’ll create a generic Makefile next version I release.

I created a ConsoleBasic object, then added the cls command. You can see I add it in the constructor, then in execAddonCommand I check the token that is passed in to figure out what command I should execute, which in this case can only be one command, then clear the screen via ANSI escape codes.

Next example will show how to make your C++ variables available to BASIC.

class ConsoleBasic : public SmallBasic
    int m_cls;
    ConsoleBasic(const char* pszFilename)
        : SmallBasic(pszFilename),m_cls(0)
        m_cls = addCommand("cls");

    bool execAddonCommand(const int tok)
        if(tok == m_cls)
        return true;