Nyall Dawson 08a9bcba0a Unify scale widgets API
Flip all scale based widgets to use scale denominators instead
of actual scales (ie 100.0 instead of 0.01 for 1:100).

This is done for consistency with the rest of the API, which
predominantly uses scale denominators. It also helps
precision loss as a result of multiple 1.0 / scale conversions
throughout the code.

Refs #15337
2017-06-09 09:11:10 +10:00
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