The schroedinger headers unconditionally #define over C99's rint when
compiling with msvc which messes up the later inclusion of math.h.
Including math.h before schroedinger headers avoids getting syntax
errors in math.h
https://bugzilla.gnome.org/show_bug.cgi?id=775293
This uses the automatic YCoCg conversion inside Schroedinger to
encode/decode RGB. Only works in intra-only mode, similar to 10-
and 16-bit, since RGB is technically a >8-bit format for Dirac
purposes. This depends on schroedinger-1.0.12, which is unreleased.
Also move schroedinger plugin. This creates a new library,
gstbasevideo-0.10, which will probably be merged back into
gstvideo-0.10 when this is moved back to -base.
