packaging: remove py2exe / Python 2.7 support
This commit started by deleting references to py2exe (which is only used
on Python 2). After pulling the thread, quite a lot of code was orphaned
and was deleted.
Differential Revision: https://phab.mercurial-scm.org/D12265
{
// Enforcing
"eqeqeq" : true, // true: Require triple equals (===) for comparison
"forin" : true, // true: Require filtering for..in loops with obj.hasOwnProperty()
"freeze" : true, // true: prohibits overwriting prototypes of native objects such as Array, Date etc.
"nonbsp" : true, // true: Prohibit "non-breaking whitespace" characters.
"undef" : true, // true: Require all non-global variables to be declared (prevents global leaks)
// Environments
"browser" : true // Web Browser (window, document, etc)
}