Create display and event handler (using pygame)

* Display height and width is determined by the font size, game window
size is 80 columns by 25 lines to accommodate traditions.
* Original idea with combination of InputMgr and Event classes is
solely replaced by event module, where pygame.event functions as
original InputMgr class. Unneeded now getch module is removed as well
* Add and use "Bitstream Vera Mono" font (custom license is available at
https://www-old.gnome.org/fonts/#Final_Bitstream_Vera_Fonts).

Minor:
* Change host from www.example.com to 127.0.0.1 for development.