Fixes escape sequence bug and enhancements in Presym scanning #6045
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In #6011, a hexadecimal escape sequence followed by a hexadecimal character would cause a compile error. Also, avoid using "Numbered Parameter" which older Ruby does not have (e.g. AppVeyor).
ref. #6044
In the verification with
conf.enable_debug
in the build by MSVC:https://github.com/dearblue/mruby/actions/runs/6122499107/job/16618399040#step:4:499
mrbtest
fails.https://github.com/dearblue/mruby/actions/runs/6122499387/job/16618399785#step:4:2540
Fixed #6044