[Automatic fixed-to-float.sh change] Applies all scripted changes

This is the result of running a number of sed and perl scripts over the code to
do 90% of the work in converting from 16.16 fixed to single precision floating
point.

Note: A pristine cogl-fixed.c has been maintained as a standalone utility API
      so that applications may still take advantage of fixed point if they
      desire for certain optimisations where lower precision may be acceptable.

Note: no API changes were made in Clutter, only in Cogl.

Overview of changes:
- Within clutter/* all usage of the COGL_FIXED_ macros have been changed to use
the CLUTTER_FIXED_ macros.

- Within cogl/* all usage of the COGL_FIXED_ macros have been completly stripped
and expanded into code that works with single precision floats instead.

- Uses of cogl_fixed_* have been replaced with single precision math.h
alternatives.

- Uses of COGL_ANGLE_* and cogl_angle_* have been replaced so we use a float for
angles and math.h replacements.

clutter/clutter-behaviour-depth.c

@@ -83,9 +83,9 @@ clutter_behaviour_depth_alpha_notify (ClutterBehaviour *behaviour,
   priv = CLUTTER_BEHAVIOUR_DEPTH (behaviour)->priv;
 
   /* Need to create factor as to avoid borking signedness */
-  factor = COGL_FIXED_FROM_INT (alpha_value) / CLUTTER_ALPHA_MAX_ALPHA;
+  factor = (float)(alpha_value) / CLUTTER_ALPHA_MAX_ALPHA;
   depth  = priv->depth_start
-         + COGL_FIXED_TO_INT (factor * (priv->depth_end - priv->depth_start));
+         +  (factor * (priv->depth_end - priv->depth_start));
 
   CLUTTER_NOTE (BEHAVIOUR, "alpha: %d, depth: %d", alpha_value, depth);