Alpha 0.4.4 15w031

Mainly a developer's update.

• Made code more memory efficient.
• Added a far-call procedure vector table for far calling.
• Added a small jump hub for connecting typing and backspace handling functions. (Not ready to be used.)
• Added character print function.
• Buffer at 0x501, pointer at 0x500.
• When typing, input will be buffered into 0x501.
• The pointer is reset every 'return'.
• Backspace works for input buffering.
• Backspace is no longer allowed on the first character of the line. (It'll just stop.)
• Added system init messages.
• Note: Input per line is limited to 256 characters as a result of the buffer.
• Note: All input on and after the cursor will be discarded, although not visually, when pressing 'return'.
• Note: Command-J (linefeed) and such will result in linefeed getting buffered and printed. The system therefore may not respond to your command correctly.