Features/Tick based animation

Summary
Animate each frame as Gtk+ needs a new frame drawn instead of at whatever frame rate we want.

Owner

 * Name: Sam P.
 * Email: *@sam.today

Current status

 * Targeted release: 0.108
 * Last updated: 4 July 2015
 * Percentage of completion: 50%

Detailed Description
Gtk+ 3.8 introduces the idea of a 'tick'. This can have a callback attached to it. This is used to do animations in GtkPopover and the other Gtk+ widgets that have animations. Therefore, sugar should not just do out animations at 20fps. If the animation could go at 120fps because the computer is awesome, why not? If the computer is bad and it can only render 5fps, why worry about any more?

This feature can be split up into many parts:


 * Toolkit implementation (100%): https://github.com/sugarlabs/sugar-toolkit-gtk3/pull/213
 * Frame and Home view (100%): https://github.com/sugarlabs/sugar/pull/505  Frame and homeview are a good spot for tick based animation as we are not cpu bound to open the frame or change views - the animation can take up 100% cpu and all will be fine
 * Pulsing icon (20%): https://github.com/sugarlabs/sugar/pull/513  Opening an activity is a cpu bound task, so this is probably the wrong space for animations that steal all of the cpu.

Benefit to Sugar
Smoother animation.

No legit, that is the only benefit.

Scope
Doesn't break anything.

Animation consumers need to add the "widget=x" when creating an animator so they can have the tick callback attached.

UI Design
Some animations (aka. plusing icon) look completely different when they are actually smooth.

How To Test
1. Apply the patches  and  2. Open the frame and notice the smoothness 3. Press F6 over and over again to enjoy all the frames in the animation 4. Change between home views (F1-F3) to enjoy the smoothness of the animating size of the xo-person

User Experience
Smoother animations.

Dependencies
Needs Gtk 3.8 to look different.

Contingency Plan
None necessary, revert to previous release behaviour

Documentation
add the widget=x

Release Notes
Animations are now smoother than ever on newer hardware. Animations dynamically change FPS to leave no cpu cycle wasted.

Comments and Discussion
All the pull requests