Fix: Command-line arguments incorrectly handled

* Traceback generator always tried to write tb -> double fail on Exception.
* Config file was not parsed
Added primitive "sight range" calculations to Map

NPCs are only drawn if they are in sight, dungeon and
item piles are highlighted if in sight.
Added MapOverview-view

Navigate over a fullscreen version of the map.
Inventory-view automaticaly uses player's inventory now

Before, it was necessary to manualy pass the inventory to
view when activating the view, which is completely stupid.
Added wielder-information to wieldable items

Wieldable items now know who wields them, changing the on_wield_attack
method. It also serves as information for manipulating code, so they know
for sure that the Item is in use.
Fixed not-round view highlighting

The view hightlight range was truncated by to small iteration ranges.
Dungeon "fog of war"-display

Display only parts of the map that were visited by the player before.