Shape moving restrictions based on anchor properties.
This is the page anchors equivalent of the char and paragraph anchors code we already have. This makes a difference both on initial layout (nice improvements) and on interactive moving of page anchored shapes. This commit also fixes the default anchoring properties to be the same as in LO. This commit also fixes it so the page anchored iages doesn't leave empty rects on page 1 after reload BUG: 312193 BUG: 310715 BUG: 312982 REVIEW: 108358
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