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

compiler/ic/cbackend.nim

@@ -18,8 +18,8 @@
 ## also doing cross-module dependency tracking and DCE that we don't need
 ## anymore. DCE is now done as prepass over the entire packed module graph.
 
-import std/[packedsets, algorithm, tables]
-  # std/intsets would give `UnusedImport`, pending https://github.com/nim-lang/Nim/issues/14246
+import std/packedsets, algorithm, tables
+
 import ".."/[ast, options, lineinfos, modulegraphs, cgendata, cgen,
   pathutils, extccomp, msgs]
 
@@ -70,7 +70,7 @@ proc addFileToLink(config: ConfigRef; m: PSym) =
     addFileToCompile(config, cf)
 
 when defined(debugDce):
-  import std / [os, packedsets]
+  import os, std/packedsets
 
 proc storeAliveSymsImpl(asymFile: AbsoluteFile; s: seq[int32]) =
   var f = rodfiles.create(asymFile.string)

compiler/ic/dce.nim

@@ -9,7 +9,7 @@
 
 ## Dead code elimination (=DCE) for IC.
 
-import std / [intsets, tables]
+import intsets, tables
 import ".." / [ast, options, lineinfos, types]
 
 import packed_ast, ic, bitabs

compiler/ic/ic.nim

@@ -7,12 +7,12 @@
 #    distribution, for details about the copyright.
 #
 
-import std / [hashes, tables, intsets, sha1]
+import hashes, tables, intsets, std/sha1
 import packed_ast, bitabs, rodfiles
 import ".." / [ast, idents, lineinfos, msgs, ropes, options,
   pathutils, condsyms]
 #import ".." / [renderer, astalgo]
-from std / os import removeFile, isAbsolute
+from os import removeFile, isAbsolute
 
 type
   PackedConfig* = object
@@ -143,7 +143,7 @@ const
   debugConfigDiff = defined(debugConfigDiff)
 
 when debugConfigDiff:
-  import std / [hashes, tables, intsets, sha1, strutils, sets]
+  import hashes, tables, intsets, sha1, strutils, sets
 
 proc configIdentical(m: PackedModule; config: ConfigRef): bool =
   result = m.definedSymbols == definedSymbolsAsString(config)

compiler/ic/integrity.nim

@@ -10,7 +10,7 @@
 ## Integrity checking for a set of .rod files.
 ## The set must cover a complete Nim project.
 
-import std / sets
+import sets
 import ".." / [ast, modulegraphs]
 import packed_ast, bitabs, ic
 

compiler/ic/navigator.nim

@@ -11,7 +11,7 @@
 ## IDE-like features. It uses the set of .rod files to accomplish
 ## its task. The set must cover a complete Nim project.
 
-import std / sets
+import sets
 
 from os import nil
 from std/private/miscdollars import toLocation

compiler/ic/packed_ast.nim

@@ -12,7 +12,7 @@
 ## use this representation directly in all the transformations,
 ## it is superior.
 
-import std / [hashes, tables, strtabs]
+import hashes, tables, strtabs
 import bitabs
 import ".." / [ast, options]