SilverBullet pivot to become an offline-first PWA (#403)

common/crypto.ts

@@ -0,0 +1,12 @@
+export function simpleHash(s: string): number {
+  let hash = 0,
+    i,
+    chr;
+  if (s.length === 0) return hash;
+  for (i = 0; i < s.length; i++) {
+    chr = s.charCodeAt(i);
+    hash = ((hash << 5) - hash) + chr;
+    hash |= 0; // Convert to 32bit integer
+  }
+  return hash;
+}