This will allow to easily implement camelCase wrappers aside stdlib,
even without changing hashes of existing contracts.
Also, stdlib renamings could be easily performed in the same manner,
even with arguments reordered.
* fully refactor run_tests.py, make it extensible for the future
* an ability to write @compilation_should_fail tests
* an ability to launch run_tests.py for a single .fc file
* keep run_tests.js in sync with run_tests.py
* extract legacy_tests names/hashes to a separate file
shared between legacy_tester.py and legacy_tester.js
