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

std/algorithm.d

@@ -408,7 +408,7 @@ private T* addressOf(T)(ref T val) { return &val; }
 // Also helps with missing imports errors.
 private template algoFormat()
 {
-    import std.string : format;
+    import std.format : format;
     alias algoFormat = std.string.format;
 }
 
@@ -3632,7 +3632,7 @@ private struct SplitterResult(alias isTerminator, Range)
     import std.uni : isWhite;
 
     //@@@6791@@@
-    assert(equal(std.array.splitter("là dove terminava quella valle"), ["là", "dove", "terminava", "quella", "valle"]));
+    assert(equal(splitter("là dove terminava quella valle"), ["là", "dove", "terminava", "quella", "valle"]));
     assert(equal(splitter!(std.uni.isWhite)("là dove terminava quella valle"), ["là", "dove", "terminava", "quella", "valle"]));
     assert(equal(splitter!"a=='本'"("日本語"), ["日", "語"]));
 }
@@ -13879,7 +13879,7 @@ auto castSwitch(choices...)(Object switchObject)
 ///
 unittest
 {
-    import std.string : format;
+    import std.format : format;
 
     class A
     {