feat(core): update session, security system and QR exchange

- Removed session creation and Lightning payment logic
- Refactored security system:
  * no more restrictions
  * all systems enabled on session creation
- Improved QR code exchange for mobile devices

node_modules/html5-qrcode/src/camera/permissions.ts

@@ -0,0 +1,34 @@
+/**
+ * @fileoverview
+ * Libraries associated with Camera Permissions.
+ * 
+ * @author mebjas <minhazav@gmail.com>
+ */
+
+/**
+ * Permission management around Camera in javascript.
+ * 
+ * TODO(mebjas): Migrate camera specific code / logic to this class / library.
+ */
+ export class CameraPermissions {
+
+    /**
+     * Returns {@code true} if the web page already has access to user camera 
+     * permissions.
+     */
+    public static async hasPermissions(): Promise<boolean> {
+      // TODO(mebjas): Use Permissions Query API, once support is widespread.
+      // https://developer.mozilla.org/en-US/docs/Web/API/Permissions/query
+  
+      let devices = await navigator.mediaDevices.enumerateDevices();
+      for (const device of devices) {
+        // Hacky way to check if camera permissions are granted. Device
+        // labels are only set in case user has granted permissions.
+        if(device.kind === "videoinput" && device.label) {
+          return true;
+        }
+      }
+  
+      return false;
+    }
+}