dummy ranges module

rm

rename & add scope imports

update scope imports

std.algorithm: clean imports

update scope imports

update global imports

update *.mak

ditto

formatting

fix typo

fix scope import std.uni

update windows  *.mak

add import to unittests

tabs fix

fix unittest

fix indentation
Merge pull request #2691 from 9il/dummyranges

move dummy ranges and clean imports in std.algorithm