Program startup

When a TOM program starts, the following sequence of actions is taken:

• If the program was not statically resolved, build the method dispatch tables and other runtime structures needed but not built by the resolver. When run, this installs what the GNU Objective-C runtime very nicely calls the `premature' dispatch table for each object. Upon invocation of a method through said table, the actual dispatch table will be built and put in place.
• Collect the arguments to the program, excluding C's argv[0], in tom.ByteString objects into tom.Runtime.all_arguments. Set the tom.Runtime.program_name and tom.Runtime.long_program_name from argv[0].
• Initialize the in, out, and err streams of tom.stdio.
• Invoke the load imps, i.e. every class method matching void load Array arguments, with the arguments collected from the command line. A load imp is allowed to recognize options and remove them from the arguments. It is customary for such options to start with a colon (`:') instead of a dash (`-').
• Store the array of remaining arguments in tom.Runtime.arguments.
• Invoke the following method of the class tom.Runtime:

  int
        start (All, selector) (object, sel)
    arguments Array arguments;
  

  where the sel is the selector for the main method to be invoked, which normally is int main Array arguments. The object is the receiver of this message, normally a class object.
• When the previous method invocation returns, all open streams are flushed and the value it returned it used as the exit code.

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