Write serialization method for CircularEnt class
Write serialization method for RectangularEnt class
Add fields describing symulation area dimensions
Change way Buffer class works

Now it's not required to specify size of data that will
be stored in Buffer, it's now based on std::vector
Serialization methods now use provided buffer

Instead of returning newly allocated buffer use the
one provided as argument
Write serialization method for whole Symulation object
Start writting simple Visualiser in C#

Right now visualiser is able to receive data of
circular entities