Add JRPC API, reworked Login and User pages

InternalAPI/login.jrpc

@@ -0,0 +1,21 @@
+import "./twofactor";
+
+type LoginState {
+   success: boolean;
+   username?: string;
+   password?: boolean;
+   passwordSalt?: string;
+   requireTwoFactor?: TFAOption[];
+}
+
+
+service LoginService {
+   GetState(): LoginState;
+   Start(username: string): LoginState;
+   UsePassword(password_hash: string, date: int): LoginState;
+
+   UseTOTP(id: string, code: string): LoginState;
+   UseBackupCode(id: string, code:string): LoginState;
+   GetWebAuthnChallenge(id: string): string;
+   UseWebAuthn(id: string, response: string): LoginState;
+}