- globals.ts
Created _Scheduler object.

- cpu.ts
Removed extraneous code.

- scheduler.ts
Created CPU Scheduler class.
Contains: constructor, which creates Scheduler object; addProcess(), which
adds a process to the Scheduler; contextSwitch(), which executes a context
switch; onCycle(), which decrements time unit counters each CPU cycle.

- shell.ts
Began work on runall command.
Amended load so that no code will be loaded into memory if no code is
given by user.