RCORE: introduce ScopedLocale and ScopedPosixLocale helper classes
RCORE: use ScopedPosixLocale for cprintf and strtod
TESTS: fix assertion to pass make check in POSIX/C locale
RCORE: use POSIX/C locale for all string functions, except string_locale_printf and current_locale_strtold
AIDA: remove unneeded locale fiddling
Merge branch 'fix-locales'

* fix-locales:
  AIDA: remove unneeded locale fiddling
  RCORE: use POSIX/C locale for all string functions, except string_locale_printf and current_locale_strtold
  TESTS: fix assertion to pass make check in POSIX/C locale
  RCORE: use ScopedPosixLocale for cprintf and strtod
  RCORE: introduce ScopedLocale and ScopedPosixLocale helper classes