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>

dScripts/ai/NS/WH/RockHydrantSmashable.cpp

@@ -1,5 +1,6 @@
 #include "RockHydrantSmashable.h"
 #include "EntityManager.h"
+#include "EntityInfo.h"
 #include "GeneralUtils.h"
 
 void RockHydrantSmashable::OnDie(Entity* self, Entity* killer) {