UX Fix: More player help on init

User experience updates to give player some more help/context at the beginning of the game, including printing an abbreviated list of commands.
Updated the map with a small legend and some colour for player char and ghost char. Ghost char is the same colour as its text typically is.

Files updated:

henchalien:

• new function terminalGreetings to more easily print help information
• added ghost chatter to hint for players to talk to it

validCommands:

• added legend after map is printed in map command

player; interactiveobjects:

• updated draw() to print with colours (player: orange; ghost: hot pink; other items: light blue)