- Fixes `Proxy from Elementum settings` setting

Log reported setting applied without really doing anything.

- Adds `Proxy from Elementum (resolve hosts by proxy)` setting option

Option enables default behaviour of `Elementum` in `Burst`. Option is set as new default,
existing users should not be affected by change.

- Adds choice of additional proxy protocols in settings

`SOCKS4a` (`SOCKS4` latest version with hostname resolve by proxy)
`SOCKS5h` (`SOCKS5` latest version with hostname resolve by proxy). Protocol is set as new
default to match default setting in `Elementum`, existing users should not be affected by
change.

- Adds help label for `use_elementum_proxy` setting