- Added ConsoleRenderer interface, which abstracts all relevant
operations needed to set up and write characters to a text mode display
- ConsoleFont now has tileWidth/tileHeight parameters
- PrintConsole now holds a pointer to a ConsoleRenderer
- Added consoleExit for deinitializing the console
- Added consoleUpdate for updating the display every frame
- Corrected lots of obsolete/outdated comments
- Separated console software renderer into its own file (console_sw.c)
- Added getDefaultConsoleRenderer weak function, for selecting the
default console renderer when none (NULL) is specified in PrintConsole
- Software renderer now takes care of gfxInitDefault/gfxExit
- All these changes are backwards compatible with older programs because:
- gfxInitDefault has double-init protection
- Old programs don't call consoleUpdate/Exit, but their implementation
in the software renderer is identical to what old programs were
already doing anyway
