Mark old classes as deprecated

Author: richvdh

src/crypto/verification/Base.ts

@@ -57,6 +57,7 @@ export type VerificationEventHandlerMap = {
     [VerificationEvent.Cancel]: (e: Error | MatrixEvent) => void;
 };
 
+/** @deprecated Avoid referencing this class directly; instead use {@link Crypto.Verifier}. */
 // The type parameters of VerificationBase are no longer used, but we need some placeholders to maintain
 // backwards compatibility with applications that reference the class.
 export class VerificationBase<

src/crypto/verification/QRCode.ts

@@ -36,6 +36,7 @@ export type QrCodeEvent = VerifierEvent;
 /** @deprecated use VerifierEvent */
 export const QrCodeEvent = VerifierEvent;
 
+/** @deprecated Avoid referencing this class directly; instead use {@link Crypto.Verifier}. */
 export class ReciprocateQRCode extends Base {
     public reciprocateQREvent?: ShowQrCodeCallbacks;
 

src/crypto/verification/SAS.ts

@@ -219,6 +219,7 @@ export type SasEvent = VerifierEvent;
 /** @deprecated use VerifierEvent */
 export const SasEvent = VerifierEvent;
 
+/** @deprecated Avoid referencing this class directly; instead use {@link Crypto.Verifier}. */
 export class SAS extends Base {
     private waitingForAccept?: boolean;
     public ourSASPubKey?: string;