replace old-style published feed with universal secretkey-based approach used for all feeds; do not allow user/pass handling in generated feed urls; bump schema

schema/versions/mysql/69.sql

@@ -0,0 +1,12 @@
+begin;
+
+create table ttrss_access_keys (id serial not null primary key,
+	access_key varchar(250) not null,
+	feed_id varchar(250) not null,
+	is_cat bool not null default false,
+	owner_uid integer not null,
+  	foreign key (owner_uid) references ttrss_users(id) ON DELETE CASCADE) TYPE=InnoDB DEFAULT CHARSET=UTF8;
+
+update ttrss_version set schema_version = 69;
+
+commit;