arc is making use of own array, string, associative_array, code cleanup etc...
prepared for new arc core
extended exception interface
make use of references
changed readme
added string literals, code cleanup etc..
renamed unknown_key to not_found
network module makes now use of new types
changed filesystem module
code cleanup
login module makes use of new types
fixed compiler issues
uri module makes use of new types
code cleanup
removed reference
arc 2.0