ntripcaster: move to github

Signed-off-by: Nuno Goncalves <nunojpg@gmail.com>
ntripserver: move to github

Signed-off-by: Nuno Goncalves <nunojpg@gmail.com>
ntripclient: move to github

Signed-off-by: Nuno Goncalves <nunojpg@gmail.com>
rtklib: move to github, bump version to 2.4.2 p9

Signed-off-by: Nuno Goncalves <nunojpg@gmail.com>
remserial: move to github

Signed-off-by: Nuno Goncalves <nunojpg@gmail.com>