Re-implementation of the Print Shop "Thinking / Printing" animated banner.

Was struggling to get this to fit in 141 bytes for the Apple II Basic Bot.
Managed in the end to get a version that had animated bars instead of boxes.


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"Proper" Version
****************

	See the thinking_flip.s / THINKING_FLIP code.

	This draws offscreen.  First the boxes, cascading inward,
	(using direct RAM writes to draw the boxes).
	A separate loop then overwrites with the bitmap.
	Page flipping is used, so it alternates PAGE1/PAGE2.

	The code is callable as a function so you can add hooks into
	it from existing code as a progress indicator.

	Downsides: lots of over-writing (speed), also you need to
	have the 1k of RAM at $800 free for PAGE2 use.

	Total size approaches 256 bytes

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Other attempts
**************

Various other attempts tried:

+ Drawing the boxes using Applesoft/Monitor ROM routines for a box
	(4 sides), then drawing the bitmap on top.
	This is too slow and makes flicker, also the code is large.
	(some preliminary attempt to this is in THINKING_ATTEMPT4)

+ Drawing the boxes using HLINE instead of direct mem writes.
	Slower, so very noticable that you're drawing things.
	Still couldn't get below 153 bytes.
	See thinking_slow.s / THINKING_SLOW

+ Using box drawing code from my various box-drawing demos.
	This ends up being too large

+ RLE encoding the image.  Too big

+ Looking for the color progression in ROM (Didn't have to be exact,
	just low bytes the same).  Sadly not there

+ Drawing the boxes/text offscreen and basically do a palette-shifting
	type thing.  This is possible (though tricky as there are 10
	boxes but only 8 colors so it's not a straight up palette shift).
	This has the same limitations that page-flipping does in that
	you need an offscreen area.
	See t3.s / T3 for implementation.  Still large (192 bytes)

+ BOT version
	Fits in 141 bytes.

	See thinking_bot.s THINKING_BOT
	Only draws lines that rotate, not boxes.
	Draws bitmap at same time as drawing lines, meaning there is no
	overdraw so no flicker.