fix: better memory management ( Z_Free() instead of free() )

Signed-off-by: Stephen L. <lrq3000@gmail.com>
add: README.md infos on how to update on git

Signed-off-by: Stephen L. <lrq3000@gmail.com>
add: more infos about git updating and syncing with ioquake3 in README.md

Signed-off-by: Stephen L. <lrq3000@gmail.com>
fix: big memory leaks.

Signed-off-by: Stephen L. <lrq3000@gmail.com>
fix: Fixed the memory leaks for good! Thank's valgrind!

Signed-off-by: Stephen L. <lrq3000@gmail.com>