fully remove linked lists in struct players
server: fix *** glibc detected ***  double free or corruption on exit
fix unbreable wall on outermost west and south
add fixme to server code
client: use system $USER, before 'somenick'
Revert "use ${CC} istead gcc in Makefile"

This reverts commit a26cc351525f3f955bd65fb6eca13346b88b3ffa.
Merge branch 'develop' of github.com:noktoborus/shooter into develop
Merge branch 'develop' of github.com:noktoborus/shooter into develop