CIs: attempt to use csources_v1 (#16282)

* CIs: attempt to use csources_v1
* also updated the BSDs
* also updated azure pipelines
* std modules should not itself use the 'std/' import dir...
* compiler has to be careful with std/ for v1 booting

(cherry picked from commit a9b62de895)

lib/pure/os.nim

@@ -965,6 +965,8 @@ proc expandTilde*(path: string): string {.
   ## Windows: this is still supported despite Windows platform not having this
   ## convention; also, both ``~/`` and ``~\`` are handled.
   ##
+  ## **Warning**: `~bob` and `~bob/` are not yet handled correctly.
+  ##
   ## See also:
   ## * `getHomeDir proc <#getHomeDir>`_
   ## * `getConfigDir proc <#getConfigDir>`_

lib/pure/sugar.nim

@@ -11,7 +11,7 @@
 ## macro system.
 
 import std/private/since
-import macros, typetraits
+import macros
 
 proc checkPragma(ex, prag: var NimNode) =
   since (1, 3):

lib/pure/typetraits.nim

@@ -108,7 +108,7 @@ since (1, 3, 5):
       doAssert elementType(myiter(3)) is int
     typeof(block: (for ai in a: ai))
 
-import std/macros
+import macros
 
 macro genericParamsImpl(T: typedesc): untyped =
   # auxiliary macro needed, can't do it directly in `genericParams`

lib/std/jsonutils.nim

@@ -13,7 +13,7 @@ runnableExamples:
   let j = a.toJson
   doAssert j.jsonTo(type(a)).toJson == j
 
-import std/[json,strutils,tables,sets,strtabs,options]
+import json, strutils, tables, sets, strtabs, options
 
 #[
 Future directions:
@@ -27,7 +27,7 @@ add a way to customize serialization, for e.g.:
   objects.
 ]#
 
-import std/macros
+import macros
 
 type
   Joptions* = object
@@ -106,7 +106,7 @@ proc hasField[T](obj: T, field: string): bool =
       return true
   return false
 
-macro accessField(obj: typed, name: static string): untyped = 
+macro accessField(obj: typed, name: static string): untyped =
   newDotExpr(obj, ident(name))
 
 template fromJsonFields(newObj, oldObj, json, discKeys, opt) =
@@ -146,7 +146,7 @@ template fromJsonFields(newObj, oldObj, json, discKeys, opt) =
       json.len == numMatched
     else:
       json.len == num and num == numMatched
-  
+
   checkJson ok, $(json.len, num, numMatched, $T, json)
 
 proc fromJson*[T](a: var T, b: JsonNode, opt = Joptions())
@@ -278,7 +278,7 @@ proc toJson*[T](a: T): JsonNode =
 proc fromJsonHook*[K, V](t: var (Table[K, V] | OrderedTable[K, V]),
                          jsonNode: JsonNode) =
   ## Enables `fromJson` for `Table` and `OrderedTable` types.
-  ## 
+  ##
   ## See also:
   ## * `toJsonHook proc<#toJsonHook,(Table[K,V]|OrderedTable[K,V])>`_
   runnableExamples:
@@ -314,7 +314,7 @@ proc toJsonHook*[K, V](t: (Table[K, V] | OrderedTable[K, V])): JsonNode =
 
 proc fromJsonHook*[A](s: var SomeSet[A], jsonNode: JsonNode) =
   ## Enables `fromJson` for `HashSet` and `OrderedSet` types.
-  ## 
+  ##
   ## See also:
   ## * `toJsonHook proc<#toJsonHook,SomeSet[A]>`_
   runnableExamples:
@@ -348,7 +348,7 @@ proc toJsonHook*[A](s: SomeSet[A]): JsonNode =
 
 proc fromJsonHook*[T](self: var Option[T], jsonNode: JsonNode) =
   ## Enables `fromJson` for `Option` types.
-  ## 
+  ##
   ## See also:
   ## * `toJsonHook proc<#toJsonHook,Option[T]>`_
   runnableExamples:
@@ -383,7 +383,7 @@ proc toJsonHook*[T](self: Option[T]): JsonNode =
 
 proc fromJsonHook*(a: var StringTableRef, b: JsonNode) =
   ## Enables `fromJson` for `StringTableRef` type.
-  ## 
+  ##
   ## See also:
   ## * `toJsonHook` proc<#toJsonHook,StringTableRef>`_
   runnableExamples:
@@ -401,7 +401,7 @@ proc fromJsonHook*(a: var StringTableRef, b: JsonNode) =
 
 proc toJsonHook*(a: StringTableRef): JsonNode =
   ## Enables `toJson` for `StringTableRef` type.
-  ## 
+  ##
   ## See also:
   ## * `fromJsonHook` proc<#fromJsonHook,StringTableRef,JsonNode>`_
   runnableExamples:

lib/std/monotimes.nim

@@ -74,7 +74,7 @@ when defined(js):
     system.`+`(a, b)
   {.pop.}
 
-elif defined(posix):
+elif defined(posix) and not defined(osx):
   import posix
 
 elif defined(windows):

lib/std/private/globs.nim

@@ -4,7 +4,7 @@ this can eventually be moved to std/os and `walkDirRec` can be implemented in te
 to avoid duplication
 ]##
 
-import std/[os,strutils]
+import os, strutils
 
 type
   PathEntry* = object

lib/std/sha1.nim

@@ -33,8 +33,8 @@ runnableExamples:
 ## * `hashes module<hashes.html>`_ for efficient computations of hash values for diverse Nim types
 ## * `md5 module<md5.html>`_ implements the MD5 checksum algorithm
 
-import std/strutils
-from std/endians import bigEndian32, bigEndian64
+import strutils
+from endians import bigEndian32, bigEndian64
 
 const Sha1DigestSize = 20
 

lib/std/wrapnils.nim

@@ -82,7 +82,7 @@ template `[]`*(a: Wrapnil): untyped =
   else:
     default(T)
 
-import std/macros
+import macros
 
 proc replace(n: NimNode): NimNode =
   if n.kind == nnkPar: