Use the C++ API.

The "bool" type is built-in.

RTTI adds overhead to the binary, and we don't need that.

We don't use exceptions currently.  Since allowing exceptions means a
lot of overhead, this commit disables the feature.

Allows eliminating more dead code.  Adds two more C++ options that may
reduce the binary size.

Conflicts:
	src/PlaylistSave.cxx

The song's URI must be UTF-8, not filesystem character set.

Fixes minor Windows compatibility problem.