[#35] Moved code into own module directory, added submodule, removed glfw dependency

.gitmodules

modules/CMakeLists.txt

modules/camera/CMakeLists.txt

modules/camera/config/GLM.cmake

modules/camera/include/vkcv/camera/Camera.hpp

modules/camera/include/vkcv/camera/TrackballCamera.hpp

modules/camera/lib/glm

modules/camera/src/vkcv/camera/Camera.cpp

modules/camera/src/vkcv/camera/TrackballCamera.cpp

modules/testing/CMakeLists.txt

modules/testing/GLFW.cmake

modules/testing/GLM.cmake