Remove relative includes for 3rdparty imports (#7609)

This also changes the imports for config, custom to use the src include path

src/map/script.cpp

@@ -15,7 +15,7 @@
 #include <stdlib.h> // atoi, strtol, strtoll, exit
 
 #ifdef PCRE_SUPPORT
-#include "../../3rdparty/pcre/include/pcre.h" // preg_match
+#include <pcre.h> // preg_match
 #endif
 
 #include <common/cbasetypes.hpp>
@@ -26914,7 +26914,7 @@ BUILDIN_FUNC(macro_detector) {
 	return SCRIPT_CMD_SUCCESS;
 }
 
-#include "../custom/script.inc"
+#include <custom/script.inc>
 
 // declarations that were supposed to be exported from npc_chat.cpp
 #ifdef PCRE_SUPPORT
@@ -27670,7 +27670,7 @@ struct script_function buildin_func[] = {
 	BUILDIN_DEF(isdead, "?"),
 	BUILDIN_DEF(macro_detector, "?"),
 
-#include "../custom/script_def.inc"
+#include <custom/script_def.inc>
 
 	{NULL,NULL,NULL},
 };