- add EncodingScheme.register overload that references the registered class
- just adding the FQN name of a class does not reference that class, so
it must not end up in the binary and subsequently EncodingScheme.create failed
- This used to work by chance b/c all the EncodingScheme implementations
were in a module w/ static ctor. Any user of std.encoding did drag in
that ModuleInfo, which in turn referenced all classes of std.encoding.
Since moving the static ctor to std.internal.phobosinit to break a
cycle, the classes were no longer referenced by a ModuleInfo w/ shared
ctor, so they wouldn't end up in the binary unless explicitly
referenced elsewhere.
- deprecate the old EncodingScheme.register(string fqn) b/c relying on
Object.factory is slow, error prone (linkage), and really unnecessary
- import encodinginit in std.encoding so that the
std_encoding_shared_static_this callback actually gets run
