Rename commands

[dodonator]

Renaming the "pick up" command to "take" would mean the autocompletion would be simpler an the one-word command would be in line with the other commands.

Renaming the "look at" command to "inspect" would mean that there are no more multiple word commands and the auto completion would work better.

[YtvwlD]

@vitasomething I guess this should be #16.