Add zig rc subcommand, a (cross-platform) drop-in replacement for rc.exe

[squeek502]

Uses resinator under-the-hood (see #17069)

Closes #9564

---

The cmdRc function basically works exactly the same as main.zig in standalone resinator, meaning it will have the same output that the standalone resinator does, e.g. warnings like this:

zig rc passes the win32-samples-rc-tests with perfect results (matching standalone resinator):

Found RC compiler: resinator
Found RC compiler: zig

Processed 485 .rc files

---------------------------
  resinator
---------------------------

485 .rc files processed without discrepancies
identical .res outputs:     460
expected compile errors:    25

---------------------------
  zig rc
---------------------------

485 .rc files processed without discrepancies
identical .res outputs:     460
expected compile errors:    25

---------------------------

Results when cross-compiling that same set of test files from Linux:

identical .res outputs:    199
different .res outputs:    29
unexpected compile errors: 232

These results are expected, since the failing .rc files rely on either Windows path separators, MSVC-specific include files, or case-insensitive paths. The "different .res outputs" are caused by minor differences in the MinGW headers vs the MSVC headers (things like strings in common.ver)

---

And here's the usage/help text:

> zig rc /?
Usage: zig rc [options] [--] <INPUT> [<OUTPUT>]

The sequence -- can be used to signify when to stop parsing options.
This is necessary when the input path begins with a forward slash.

Supported Win32 RC Options:
  /?, /h                  Print this help and exit.
  /v                      Verbose (print progress messages).
  /d <name>[=<value>]     Define a symbol (during preprocessing).
  /u <name>               Undefine a symbol (during preprocessing).
  /fo <value>             Specify output file path.
  /l <value>              Set default language using hexadecimal id (ex: 409).
  /ln <value>             Set default language using language name (ex: en-us).
  /i <value>              Add an include path.
  /x                      Ignore INCLUDE environment variable.
  /c <value>              Set default code page (ex: 65001).
  /w                      Warn on invalid code page in .rc (instead of error).
  /y                      Suppress warnings for duplicate control IDs.
  /n                      Null-terminate all strings in string tables.
  /sl <value>             Specify string literal length limit in percentage (1-100)
                          where 100 corresponds to a limit of 8192. If the /sl
                          option is not specified, the default limit is 4097.
  /p                      Only run the preprocessor and output a .rcpp file.

No-op Win32 RC Options:
  /nologo, /a, /r         Options that are recognized but do nothing.

Unsupported Win32 RC Options:
  /fm, /q, /g, /gn, /g1, /g2     Unsupported MUI-related options.
  /?c, /hc, /t, /tp:<prefix>,    Unsupported LCX/LCE-related options.
     /tn, /tm, /tc, /tw, /te,
                    /ti, /ta
  /z                             Unsupported font-substitution-related option.
  /s                             Unsupported HWB-related option.

Custom Options (resinator-specific):
  /:no-preprocess           Do not run the preprocessor.
  /:debug                   Output the preprocessed .rc file and the parsed AST.
  /:auto-includes <value>   Set the automatic include path detection behavior.
    any                     (default) Use MSVC if available, fall back to MinGW
    msvc                    Use MSVC include paths (must be present on the system)
    gnu                     Use MinGW include paths (requires Zig as the preprocessor)
    none                    Do not use any autodetected include paths

Note: For compatibility reasons, all custom options start with :

[squeek502]

Note:

    } else if (build_options.only_core_functionality) {
        @panic("only a few subcommands are supported in a zig2.c build");
    }

above takes care of ensuring resinator is not included in the build when only_core_functionality is true.

[andrewrk]

Nice work!