sci-libs/cantera: New package

sci-libs/cantera: New package

This commit add new package 'sci-libs/cantera' of version 2.4.0
(cantera-2.4.0.ebuild):

Description:
Cantera is an open-source suite of object-oriented software tools
for problems involving chemical kinetics, thermodynamics,
and/or transport processes.

Homepage and documentation: http://cantera.org
GitHub page: https://github.com/Cantera/cantera

Closes: https://bugs.gentoo.org/200425

Signed-off-by: Sergey Torokhov <torokhov_s_a@mail.ru>
Signed-off-by: Michał Górny <mgorny@gentoo.org>