dGame Precompiled header improvements (#876)

* moving branch

* Add deleteinven slash command

* Change name of BRICKS_IN_BBB

* Use string_view instead of strcmp

* Clean up include tree

* Remove unneeded headers from PCH files

Removes unneeded headers from pre-compiled headers.  This increases compile time, however reduces development time for most files.

* Update Entity.h

* Update EntityManager.h

* Update GameMessages.cpp

* There it compiles now

Co-authored-by: Aaron Kimbrell <aronwk.aaron@gmail.com>

dGame/dComponents/RacingControlComponent.cpp

@@ -21,6 +21,7 @@
 #include "dServer.h"
 #include "dZoneManager.h"
 #include "dConfig.h"
+#include "Loot.h"
 
 #ifndef M_PI
 #define M_PI 3.14159265358979323846264338327950288