Commits on Aug 8, 2023

1. config, src: enable nimPreviewSlimSystem …

   From the Nim 2.0.0 detailed changelog [1]:
   
       - Certain definitions from the default `system` module have been moved to
         the following new modules:
   
         - `std/syncio`
         - `std/assertions`
         - `std/formatfloat`
         - `std/objectdollar`
         - `std/widestrs`
         - `std/typedthreads`
         - `std/sysatomics`
   
         In the future, these definitions will be removed from the `system` module,
         and their respective modules will have to be imported to use them.
         Currently, to make these imports required, the `-d:nimPreviewSlimSystem` option
         may be used.
   
       - Enabling `-d:nimPreviewSlimSystem` also removes the following deprecated
         symbols in the `system` module:
         - Aliases with an `Error` suffix to exception types that have a `Defect` suffix
           (see [exceptions](https://nim-lang.github.io/Nim/exceptions.html)):
           `ArithmeticError`, `DivByZeroError`, `OverflowError`,
           `AccessViolationError`, `AssertionError`, `OutOfMemError`, `IndexError`,
           `FieldError`, `RangeError`, `StackOverflowError`, `ReraiseError`,
           `ObjectAssignmentError`, `ObjectConversionError`, `FloatingPointError`,
           `FloatOverflowError`, `FloatUnderflowError`, `FloatInexactError`,
           `DeadThreadError`, `NilAccessError`
         - `addQuitProc`, replaced by `exitprocs.addExitProc`
         - Legacy unsigned conversion operations: `ze`, `ze64`, `toU8`, `toU16`, `toU32`
         - `TaintedString`, formerly a distinct alias to `string`
         - `PInt32`, `PInt64`, `PFloat32`, `PFloat64`, aliases to
           `ptr int32`, `ptr int64`, `ptr float32`, `ptr float64`
   
       - Enabling `-d:nimPreviewSlimSystem` removes the import of `channels_builtin` in
         in the `system` module, which is replaced by `threading/channels`. Use the
         command `nimble install threading` and import `threading/channels`.
   
   Closes: 760
   
   [1] https://github.com/nim-lang/Nim/blob/v2.0.0/changelogs/changelog_2_0_0_details.md#changes-affecting-backward-compatibility

   

   ee7 committed Aug 8, 2023
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