New gamefic executables.
* Updated bin/gamefic provides commands for playing, building, and testing games.
* New shell script works the same as the gamefic command but includes the local lib directory in the load paths.
Importable game features.
Game scripts load features with the import method. Common features are available in the lib/gamefic/import directory.
String::terminalize does not strip output.
UserStream formats data for terminal display.
Renamed shell to gamefic.
Update README and example game.
Tests require gamefic and helper adds local lib directory to load paths.
Removed deprecated script methods and stubbed comments.
String#terminalize ends lines only on whitespace or hyphens.
Game code is executed at safe level 3.