added get_parameters()

[AGulev]

method that returns application parameters on mac, win and html5

defos.get_parameters()

on mac :
macos open -a "DefOS.app" --args -my_param
returns:
{
"path_to_the_app",
"-my_param"
}

on win:
DefOS.exe -my_param
returns:
{
"path_to_the_app",
"-my_param"
}

html5:
...index.html?my_param
returns:
{
"?my_param"
}