Optimize headers (part 2) (#6272)

* Optimize headers (part 2)

* less debug.h in headers
* less remoteplayer.h for everybody

* Cleanup (part 2)

* camera.h: mesh.h
* mapgen.h: mapnode.h
* serverenvironment.h: mapblock.h
* nodedef.h: shader.h

src/camera.cpp

@@ -30,7 +30,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "noise.h"         // easeCurve
 #include "sound.h"
 #include "event.h"
-#include "profiler.h"
+#include "nodedef.h"
 #include "util/numeric.h"
 #include "constants.h"
 #include "fontengine.h"