delete sl_vm_store_{get,put}, make sl_vm_t::store an array
fix ext/curl to use the new style vm store interface
fix ext/gcrypt to work with new style vm store interface
fix json ext to work with new style store interface
fix ext/mysql to work with new style vm store interface
fix ext/socket to work with new style vm store interface
fix ext/posix to work with new style vm store interface
fix ext/ruby to work with new vm store interface
don't use vm store in slash core source
alphabetically organize struct sl_vm_lib