Add more missing includes and forward declarations

src/app/system_linux.cpp

@@ -23,6 +23,7 @@
 
 #include <stdlib.h>
 #include <unistd.h>
+#include <time.h>
 
 
 void CSystemUtilsLinux::Init()

src/object/interface/movable_object.h

@@ -21,6 +21,9 @@
 
 #include "object/object_interface_type.h"
 
+class CPhysics;
+class CMotion;
+
 /**
  * \class CMovableObject
  * \brief Interface for objects that can move (have an engine)

src/object/interface/trace_drawing_object.h

@@ -21,6 +21,8 @@
 
 #include "object/object_interface_type.h"
 
+#include <string>
+
 enum class TraceColor
 {
     Default = -1,

src/ui/mainui.h

@@ -20,6 +20,8 @@
 
 #include "level/robotmain.h"
 
+#include <array>
+#include <string>
 #include <vector>