Partial fix for makefile to build std.range docs, that was broken after
std.range was split. This is only a partial fix; the full fix will have
to be done as part of [issue 13766] (https://issues.dlang.org/show_bug.cgi?id=13766).
The reason is to do not import `std.uni` tables, `std.string` and
probably `std.algorithm`. Note that format is used in CTFE code and
`Exception` handing.
And it is more comfortable to import `format` from `std.format`.
std.format: clean imports (2)
remove import std.math : pow from std.uni
update scope imports in std.algorithm
update scope imports in std.exception
doFormat -> template
update scope imports in std.typecons
update scope imports in std.functional
update scope imports in std.range
update std.conv scope import
std.format: clean imports (2)
remove import std.math : pow from std.uni
update scope imports in std.algorithm
update scope imports in std.exception
doFormat -> template
update scope imports in std.typecons
update scope imports in std.functional
update scope imports in std.range
move sfromat
add public import of sformat
use std.uni
