new std.array.replaceLast

moved string imports into static if

worked in some review

whitespace damn it

style fixes

rebase and style fixup
std.stdio: clean imports

fix

fix

remove string import

uncomment unittest

update Flag!"KeepTerminator" usage

fix typo

fix errors

private format

fix yes/no

update private format

format workaround

renamed flags to lower case
Fix missing local import in std.math.expi.
use lower-case flag strings

- so that Yes.keepTerminator/No.keepTerminator don't look so weird
Merge pull request #2727 from 9il/stdio

std.stdio: clean imports
Merge pull request #2743 from MartinNowak/fixup2731

use lower-case flag strings
Merge pull request #2742 from quickfur/expi_import

Fix missing local import in std.math.expi.
remove import std.math.pow from std.uni
Merge pull request #2744 from 9il/pow

remove import std.math.pow from std.uni
Merge pull request #2702 from burner/std_array_replaceLast

new std.array.replaceLast
std.array.join optimisation

update PR
move format to std.format

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
Merge pull request #2746 from 9il/join

std.array.join GC optimisation
Merge pull request #2732 from 9il/move

move format to std.format
Document new idiom for using Flag.