Add help, stdout, printlevel, textcolors.py

- PyDoc was imported for the help() function to work.
- The console module was updated with a printlevel function which takes
two parameters, an int which should match one of the PRINT_* levels, and
a single string to output to the console window.
- Added a ConsolePrinter object which buffers its' contents and outputs
lines to the console when a newline is submitted. Optionally, the output
will be pre-colored. sys.stdout and sys.stderr take this new object and
output blue and red text to the console respectively.
- textcolors.py is now a zdoom package module, and contains the various
text colors used by ZDoom for outputting colored console text.