Moved header files to .hpp, coordinate type usage

* include/AreaCell.h
* include/EventArea.h
* include/Unit.h
Moved do *.hpp files.

* src/EventArea.cpp
* src/Unit.cpp
* src/main.cpp
Make use of sim_crowd::Coordinates type.
More coordinates type usage, new map symbols

* include/EventArea.hpp
New cell types, fields containing positions of certain special cells,
fixed constructor.

* include/Unit.hpp
Usage of Coordinates type.

* src/EventArea.cpp
New cell types loading, special cells containers.

* src/Unit.cpp
Coordinates type appliance.

* src/main.cpp
Initialize unit with entry coordinates.

* testing/sample_area1
Added new types of cells.