rewritten PushStringEx in Forward and Function systems

fixed PushCellByRef and PushFloatByRef in the varargs case where it wouldn't set the pushed type
fixed the BindNatives functions not setting the BOUND flag thus making the JIT not exec the natives
done the rest of tests with forwards, only left to do string varargs

--HG--
extra : convert_revision : svn%3A39bc706e-5318-0410-9160-8a85361fbb7c/trunk%40197

core/interfaces/IPluginFunction.h

@@ -7,6 +7,9 @@ namespace SourceMod
 {
 	#define SM_FUNCFLAG_COPYBACK		(1<<0)		/* Copy an array/reference back after call */
 
+	#define SP_STRING_UTF8				(1<<0)		/* String should be UTF-8 handled */
+	#define SP_STRING_COPY				(1<<1)		/* String should be copied into the plugin */
+
 	/**
 	 * @brief Represents what a function needs to implement in order to be callable.
 	 */
@@ -83,14 +86,16 @@ namespace SourceMod
 		virtual int PushString(const char *string) =0;
 
 		/**
-		 * @brief Pushes a string onto the current call.
+		 * @brief Pushes a string or string buffer.
 		 * NOTE: On Execute, the pointer passed will be modified if copy-back is enabled.
 		 *
-		 * @param string	String to push.
-		 * @param flags		Copy-back flags.
+		 * @param buffer	Pointer to string buffer.
+		 * @param length	Length of buffer.
+		 * @param sz_flags	String flags.
+		 * @param cp_flags	Copy-back flags.
 		 * @return			Error code, if any.
 		 */
-		virtual int PushStringEx(char *string, int flags) =0;
+		virtual int PushStringEx(char *buffer, size_t length, int sz_flags, int cp_flags) =0;
 
 		/**
 		 * @brief Cancels a function call that is being pushed but not yet executed.