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/database-postgresql.cpp

@@ -33,7 +33,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include <netinet/in.h>
 #endif
 
-#include "log.h"
+#include "debug.h"
 #include "exceptions.h"
 #include "settings.h"
 #include "content_sao.h"