Add bookmark ignore functionality for multiple accounts

```
cat ~/.local/share/profanity/bookmark_ignore
[jubalh@iodoru.org]
profanity@rooms.dismail.de=true

[testuser@domain.org]
testr@rooms.domain.org=true
```

Regards https://github.com/profanity-im/profanity/issues/1115

src/event/common.c

@@ -40,6 +40,7 @@
 #include "xmpp/muc.h"
 #include "xmpp/xmpp.h"
 #include "database.h"
+#include "tools/bookmark_ignore.h"
 
 #ifdef HAVE_LIBGPGME
 #include "pgp/gpg.h"
@@ -69,6 +70,7 @@ ev_disconnect_cleanup(void)
     omemo_on_disconnect();
 #endif
     log_database_close();
+    bookmark_ignore_on_disconnect();
 }
 
 gboolean

src/event/server_events.c

@@ -79,6 +79,8 @@ sv_ev_login_account_success(char *account_name, gboolean secured)
 {
     ProfAccount *account = accounts_get_account(account_name);
 
+    bookmark_ignore_on_connect(account->jid);
+
     roster_create();
 
 #ifdef HAVE_LIBOTR