Add seeding for each process using tinymt32 PRNG (#29)

* Add erltrek_setup:seed() to erltrek_enterprise_commander:start/1
* Add erltrek_setup:seed() to erltrek_galaxy:init/1
* Add erltrek_setup:seed() to erltrek_game:init/1
* Add erltrek_setup:seed() to erltrek_klingon_commander:start/1
* Add erltrek_setup:seed() to erltrek_ship:init/1