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/script/cpp_api/s_async.h

@@ -25,7 +25,6 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 #include "threading/semaphore.h"
 #include "threading/thread.h"
-#include "debug.h"
 #include "lua.h"
 #include "cpp_api/s_base.h"
 

src/script/cpp_api/s_internal.h

@@ -32,7 +32,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "threading/mutex_auto_lock.h"
 
 #ifdef SCRIPTAPI_LOCK_DEBUG
-#include "debug.h" // assert()
+#include <cassert>
 
 class LockChecker {
 public: