Collected and moved existing camera infrastructure from game.cpp to camera.cpp and camera.h. Introduced configuration settings 'fov' which chooses the camera's (vertical) field of view and 'view_bobbing' which currently does nothing. Other code refactored to not expect the FOV to be a build time constant.

src/CMakeLists.txt

@@ -142,6 +142,7 @@ set(minetest_SRCS
 	mapblock_mesh.cpp
 	farmesh.cpp
 	keycode.cpp
+	camera.cpp
 	clouds.cpp
 	clientobject.cpp
 	guiMainMenu.cpp