remove the FAST_ versions of the binary asserts (not a breaking change!)

[onqtam]

From now on there will only be binary asserts and no fast binary asserts. This is done to remove complexity from the framework and its usage. The binary asserts can be made just as fast as the previously available fast ones with the help of the DOCTEST_CONFIG_SUPER_FAST_ASSERTS option - again turning them into a single function call.

There will be forwarding macros (from the fast versions to the only binary ones) for backwards compatibility. Users shouldn't actually care much about this change - the only addition to the "fast" macros is that now there is an additional try/catch block around the evaluation of expressions.