Add an option to disable account registation, and fix use of a JSContext from the wrong thread along the way.

src/ssb.db.h

@@ -360,21 +360,25 @@ bool tf_ssb_db_get_account_password_hash(tf_ssb_t* ssb, const char* name, char*
 
 /**
 ** Insert or update a user's hashed password in the database.
-** @param ssb The SSB instance.
+** @param loop The event loop.
+** @param db A DB writer.
+** @param context A JS context.
 ** @param name The username.
 ** @param password The raw password.
 ** @return true if the hash of the password was successfully stored.
 */
-bool tf_ssb_db_set_account_password(tf_ssb_t* ssb, const char* name, const char* password);
+bool tf_ssb_db_set_account_password(uv_loop_t* loop, sqlite3* db, JSContext* context, const char* name, const char* password);
 
 /**
 ** Add a user account to the database.
-** @param ssb The SSB instance.
+** @param loop The event loop.
+** @param db A DB writer.
+** @param context A JS context.
 ** @param name The username to add.
 ** @param password The user's raw password.
 ** @return true If the user was added successfully.
 */
-bool tf_ssb_db_register_account(tf_ssb_t* ssb, const char* name, const char* password);
+bool tf_ssb_db_register_account(uv_loop_t* loop, sqlite3* db, JSContext* context, const char* name, const char* password);
 
 /**
 ** Get an entry from the properties table.