PHP-CPP-LEGACY 1.7.0
WARNING: Breaking changes to the ABI and API regarding the Error class
- renamed Error to Message (to make room for the upcoming new Error class)
- moved exception to throwable (to have the base Throwable base class to ensure that PHP-CPP and PHP-CPP-LEGACY support the same code for conventions)
- added Error class that is useful to ensure that extensions can be compiled on php5 and php7
- renamed FatalError to Error
- export Error and Exception symbols