• Changed license from LGPL to Apache 2.
• Renamed public macros and "keywords".
• Extracted multithreading support to a separate library
  exceptions4c-pthreads.
• Extracted lightweight version to a separate library
  exceptions4c-lite.
• Removed non-essential public functions and typedefs.
• Removed built-in exceptions and signal handling.
• Removed support for legacy compilers.

Added

• Typee4c_exception_type
• Typee4c_debug_info
• Typee4c_exception
• Typee4c_context
• MacroEXCEPTIONS4C
• MacroTRY
• MacroCATCH
• MacroCATCH_ALL
• MacroFINALLY
• MacroTHROW
• MacroRETRY
• MacroUSING
• MacroWITH
• MacroUSE
• MacroREACQUIRE
• Functione4c_set_context_supplier
• Functione4c_get_context
• Functione4c_get_exception
• Functione4c_is_uncaught