Excel writes the relative formulas of a multi-area rule for the top-left
cell of the whole sqref (lowest row, lowest column), whatever order the
areas are listed in. GridCraft anchored them on the first area listed, so
a validation on `H62:H68 H26:H27 H93:H95` with `MOD($H26,$F26)=0` checked
row 26 - 36 at H26 and refused valid input.
Add `RangeRef::top_left` and use it in validation checks, list sources,
pasting a validation, conditional format lookups and the formulas the
xlsx writer generates for text, blank and error rules.
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