Added Struct Abstraction extension (bug 2666 and bug 2663)

--HG--
rename : extensions/structs/structs.txt => gamedata/structs.gamedata.txt
rename : extensions/structs/structs.inc => plugins/include/structs.inc
rename : extensions/structs/structtest.sp => plugins/testsuite/structtest.sp

plugins/include/structs.inc

@@ -156,6 +156,7 @@ native SetStructEnt(Handle:strct, const String:member[], entity);
 
 /**
  * Retrieves a struct handle to a FileWeaponInfo_t for the given weapon name.
+ * This handle needs to be closed when you have finished using it.
  *
  * @param weapon	Weapon name to retrieve.
  * @return			Struct handle or INVALID_HANDLE on failure.

tools/builder/PkgCore.cs

@@ -282,6 +282,14 @@ namespace builder
 			lib.vcproj_name = "clientprefs";
 			libraries.Add(lib);
 
+			lib = new Library();
+			lib.package_path = "addons/sourcemod/extensions/auto.2.ep2";
+			lib.source_path = "extensions/structs";
+			lib.binary_name = "structs.ext";
+			lib.vcproj_name = "sdk";
+			lib.build_mode = BuildMode.BuildMode_Episode2;
+			libraries.Add(lib);
+
 			return (Library [])libraries.ToArray(typeof(Library));
 		}