defaults to ORC (#19972)

* defaults to Orc

* bootstrap using refc

* use gc

* init orc defines

* unregister orc

* fix gc

* fix commands

* add prepareMutation for orc

* enable deepcopy for orc

* prepareMutation

* more fixes

* some cases

* bug #20081

* partial fixes

* partial fixes

* fixes command line

* more fixes

* build Nim with refc

* use gc

* more fixes

* rstore

* orc doesn't support threadpool

* more shallowCopy

* more fixes

* fixes unsafeNew

* workarounds

* small

* more fixes

* fixes some megatest

* tcodegenbugs1 refc

* fxies megatest

* build nimble with refc

* workaround tensordsl tests

* replace shallowCopy with move

* fixes action

* workaround

* add todo

* fixes important packages

* unpublic unregisterArcOrc

* fixes cpp

* enable windows

Co-authored-by: xflywind <43030857+xflywind@users.noreply.github.com>

tests/ccgbugs/t13062.nim

@@ -1,5 +1,5 @@
 discard """
-  output: "[p = nil]"
+  matrix: "--mm:refc; --mm:orc"
   targets: "c cpp"
 """
 
@@ -24,4 +24,7 @@ type
     fulfilled: Atomic[bool]
 
 var x: Pledge
-echo x.repr
+when defined(gcRefc):
+  doAssert x.repr == "[p = nil]"
+elif not defined(cpp): # fixme # bug #20081
+  doAssert x.repr == "Pledge(p: nil)"

tests/ccgbugs/tassign_nil_strings.nim

@@ -1,5 +1,5 @@
 discard """
-  cmd: "nim $target $options $file"
+  matrix: "--mm:refc"
   output: "Hello"
   ccodecheck: "\\i@'a = ((NimStringDesc*) NIM_NIL)'"
 """

tests/ccgbugs/tcodegenbug1.nim

@@ -1,4 +1,5 @@
 discard """
+  matrix: "--mm:refc"
   output: '''obj = (inner: (kind: Just, id: 7))
 obj.inner.id = 7
 id = 7

tests/ccgbugs/tdeepcopy_addr_rval.nim

@@ -1,4 +1,5 @@
 discard """
+  matrix: "--mm:refc; --mm:orc --deepcopy:on"
   output: "3"
 """
 

tests/ccgbugs/thtiobj.nim

@@ -1,4 +1,5 @@
 discard """
+  matrix: "--mm:refc"
   targets: "c cpp"
 """
 

tests/ccgbugs/tmissinginit.nim

@@ -1,4 +1,5 @@
 discard """
+  matrix: "--mm:refc"
   output: '''0
 0
 0

tests/ccgbugs/tmissingvolatile.nim

@@ -1,6 +1,6 @@
 discard """
   output: "1"
-  cmd: r"nim c --hints:on $options -d:release $file"
+  cmd: r"nim c --hints:on $options --mm:refc -d:release $file"
   ccodecheck: "'NI volatile state;'"
   targets: "c"
 """