Refactor Makefile to put all binaries to use obj and bin

[ryukinix]

Currently our Makefile put the .o and .bin files in the same directory. That could be very confusing when you are using some tree view on a file manager, because it looks very dirty. Take a look:

.
├── assets
│   └── examples
│       └── lena_gray.bmp
├── examples
│   ├── basics
│   │   ├── square-moving.bin
│   │   └── square-moving.cpp
│   ├── collision
│   │   ├── breakout.bin
│   │   ├── breakout.cpp
│   │   ├── square-platform.bin
│   │   └── square-platform.cpp
│   └── gfx
│       ├── colors-test.bin
│       ├── colors-test.cpp
│       ├── psx-doom-fire.bin
│       └── psx-doom-fire.cpp
├── hazard-memory.bin
├── LICENSE
├── Makefile
├── README.md
├── src
│   ├── collider
│   │   ├── ColliderCircle.cpp
│   │   ├── ColliderCircle.hpp
│   │   ├── ColliderCircle.o
│   │   ├── Collider.cpp
│   │   ├── Collider.hpp
│   │   ├── Collider.o
│   │   ├── ColliderRect.cpp
│   │   ├── ColliderRect.hpp
│   │   ├── ColliderRect.o
│   │   ├── ColliderScreen.cpp
│   │   ├── ColliderScreen.hpp
│   │   └── ColliderScreen.o
│   ├── Game.hpp
│   ├── gfx
│   │   └── Circle.hpp
│   ├── InputHandler.hpp
│   ├── main.cpp
│   ├── main.o
│   ├── math
│   │   └── Vector2.hpp
│   └── Ticker.hpp
├── TAGS
└── tests
    ├── TestCollision.bin
    ├── TestCollision.cpp
    ├── TestVector2D.bin
    └── TestVector2D.cpp

11 directories, 39 files

I propose to use two additional folders that are generated automatically and should not be committed (use .gitignore):

• bin/
• obj/

The bin folder should contains all the binaries, for instance generation of: executable binaries, shared libraries, static libraries
The obj should contains only .o files: it should preserve the tree structure of the file system to avoid collision.