Move Objective-C libraries located in core:sys/darwin/* to vendor:darwin/*

vendor/darwin/Foundation/NSData.odin

@@ -0,0 +1,24 @@
+package objc_Foundation
+
+@(objc_class="NSData")
+Data :: struct {using _: Copying(Data)}
+
+@(objc_type=Data, objc_name="alloc", objc_is_class_method=true)
+Data_alloc :: proc() -> ^Data {
+	return msgSend(^Data, Data, "alloc")
+}
+
+@(objc_type=Data, objc_name="init")
+Data_init :: proc(self: ^Data) -> ^Data {
+	return msgSend(^Data, self, "init")
+}
+
+@(objc_type=Data, objc_name="mutableBytes")
+Data_mutableBytes :: proc(self: ^Data) -> rawptr {
+	return msgSend(rawptr, self, "mutableBytes")
+}
+
+@(objc_type=Data, objc_name="length")
+Data_length :: proc(self: ^Data) -> UInteger {
+	return msgSend(UInteger, self, "length")
+}