[#56] Removed several compiler warnings

CMakeLists.txt

include/vkcv/Core.hpp

projects/first_triangle/src/main.cpp

projects/particle_simulation/src/Particle.cpp

projects/particle_simulation/src/Particle.hpp

projects/voxelization/src/Voxelization.cpp

projects/voxelization/src/main.cpp

src/vkcv/CommandStreamManager.cpp

src/vkcv/Core.cpp

src/vkcv/DrawcallRecording.cpp

src/vkcv/ImageManager.cpp

src/vkcv/QueueManager.cpp

src/vkcv/Swapchain.cpp

src/vkcv/Window.cpp