that's simplifies resizing and moving a lot (it's now working correctly).
* the inner text view is now only navigable if the text control should have
been navigable.
* default text view inset is now (3, 3) - but this might be adapted by the
total size of the control.
* the height of the control now takes the label into account - it may differ
from the height of the text line.
* instead of computing the size again, the BTextControl constructor now
just uses its GetPreferredSize().
* the label position now depends on the position of the text view.
* the inner text view is now centered vertically inside the BTextControl.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14865 a95241bf-73f2-0310-859d-f6bbb57e9c96
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