Basic QR tests (+ number encoding fix) (#168)

* Basic QR tests (+ number encoding fix)

* skipEncoding for Address display

* Fixup comments

packages/react-qr/src/constants.ts

@@ -2,20 +2,18 @@
 // This software may be modified and distributed under the terms
 // of the Apache-2.0 license. See the LICENSE file for details.
 
-const DEFAULT_SIZE = 300;
+const DEFAULT_IMG_SIZE = 300;
 const ADDRESS_PREFIX = 'substrate:';
-
-function createSize (size: number = DEFAULT_SIZE): Record<string, string> {
-  const height = `${size}px`;
-
-  return {
-    height,
-    width: height
-  };
-}
+const FRAME_SIZE = 1716;
+const SUBSTRATE_ID = new Uint8Array([0x53]);
+const CRYPTO_SR25519 = new Uint8Array([0x01]);
+const CMD_SIGN_TX = new Uint8Array([0x00]);
 
 export {
   ADDRESS_PREFIX,
-  DEFAULT_SIZE,
-  createSize
+  CMD_SIGN_TX,
+  CRYPTO_SR25519,
+  DEFAULT_IMG_SIZE,
+  FRAME_SIZE,
+  SUBSTRATE_ID
 };