Change all submodule links to HTTPS.

Signed-off-by: Xiong Changnian <xiong@cpan.org>
HTTPS for submodules!

* If pushing a sub is required
    then add a push remote for that sub.


Signed-off-by: Xiong Changnian <xiong@cpan.org>
Add 'plantlife' as 'plants_lib'.

Signed-off-by: Xiong Changnian <xiong@cpan.org>
Fix 'moretrees'.

Signed-off-by: Xiong Changnian <xiong@cpan.org>