Implement Worker order handling

[krogenth]

With the Strategist created in #12, we now are able to issue orders to units. All unit wrappers can call upon the Strategist's getUnitOrder(BWAPI::UnitType type) method to retrieve the next possible build to perform. A Worker should only be asking for a build order when they are not busy. Any build that fails should not be discarded, but retried(possibly double checking that a building does not already exist in that location).

To retrieve a building location, you can use BWEB to retrieve a location. BWEB's functions for onUnitDiscover, onUnitMorph, etc. should also be added to Module to properly keep track of what is where in the map as well.