Version Bump: 1.0.0-prealpha & smallfixes

Compared to v0.1.X we already broke the whole API,
and created 3 (three) new ones (C++ Raw, C RAW, C RFC),

Since our versioning scheme tracks the API incompatibilities
as the first version number, this seems like a good moment
to bump it up.

Things are finally stabilizing, too.
Of course, it's still a prealpha....
(read: precomputation sharing is incomplete/not tested enough)

Signed-off-by: Luca Fulchir <luker@fenrirproject.org>