[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-backend.c

@@ -416,7 +416,7 @@ clutter_backend_set_resolution (ClutterBackend *backend,
 
   priv = backend->priv;
 
-  fixed_dpi = COGL_FIXED_FROM_FLOAT (dpi);
+  fixed_dpi = CLUTTER_FLOAT_TO_FIXED (dpi);
   if (priv->resolution != fixed_dpi)
     priv->resolution = fixed_dpi;
 
@@ -443,7 +443,7 @@ clutter_backend_get_resolution (ClutterBackend *backend)
 {
   g_return_val_if_fail (CLUTTER_IS_BACKEND (backend), -1.0);
 
-  return COGL_FIXED_TO_FLOAT (backend->priv->resolution);
+  return CLUTTER_FIXED_TO_FLOAT (backend->priv->resolution);
 }
 
 /**