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graphics seems to be quite expensive on a new iPad3, iPad2 is much more faster (everything
is silky smooth on iPad2 :( ).


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(which means check 10^6 pixels every time if shadow path is not specified) set shadows in
a context - so Quartz knows exactly, what produces a shadow.
2. Remove "paint shadow" functions from pad painter.
3. Cleanup.


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1. When object selected in a pad, do not highlight it, only draw a shadow (like it's above the other pad's primitives).
2. Use quartz smooth shadow.
3. During device rotation, switch the shadow off (calculation is very expensive for arbitary path) - thanks to Olivier for idea.


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even white fill pattern on white background was incorrect in thumbnail.


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Also reset text matrix in IOS::PadPainter (actually, since I'm saving/restoring context state before every operation, this is not required, but just to 
be sure).


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Pure virtual 'BuildLegend' was added into TVirtualPad, so now IOS::Pad is abstract and I can not compile RootBrowser anymore.
Add empty implementation into PadStub.


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So I made all markers kDotLarge in a picker's buffer.


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