Added back interfaces the ProceduralLevelGenerator-Unity project scripts are expecting

[davidpizon]

Modified the library to add back the interfaces the ProceduralLevelGenerator-Unity project scripts are expecting to see.

Added the following interfaces: IRoomTemplate IDoorInfo IMapLayout Room

[OndrejNepozitek]

Hey! Thanks for your pull request. Unfortunately, I already synchronized the changes in this library and Unity plugin. The dev branch of Unity plugin is compatible with the dev branch of the generator. When you wrote me the email, I thought that the dev branches were already compatible, but later I found out that some changes were needed in the Unity plugin.

The dev branch of this repository is currently quite a mess. I'm finishing my master thesis and trying different ideas so the code is not properly documented and I'm expecting quite a few changes.