New boot animation for 12.1.0

[Mikus Grinbergs]

What I think is important is for the user to be given visual ASSURANCE 
that the boot process has not gotten "stuck" (e.g., the line of periods 
emitted by long-running processes).

If the indication can track fraction_completed - so much the better - 
but I do not expect the user to leave the room if the boot process takes 
longer than he expects.  Seeing "only 25% to go" is <frosting>;  the 
<chocolate_cake> is knowing "no problems thus far".

mikus   (BTW, I haven't seen the new animation)