Wasn't much of an issue when using only mousemove because that was called many times, but calling on mousedown makes the first blank frame more obvious.
* Make PaintEditor component rtl aware
Fixes the color-picker and any other popover elements.
Adds an RTL prop to the PaintEditor that initializes the `layout` state in redux. Any other components that need to know the layout refer to the state in redux.
I debated whether the state should just be a boolean (true for RTL), or ‘rtl’, ‘ltr’. I went with the latter, but could be convinced that boolean would be better.
I did not add `dir=“rtl”` to the font picker dropdown as all the names are in LTR languages.
Question: Should the sliders reverse direction, and if so, is it worth doing right now when the layout of the color picker may change.
Adding the rtl prop and the `dir=…` to the PaintEditorComponent fixes layout issues in the playground.
* Don’t reverse gradient swatches: the fill colors (and swatch preview) should represent the way the left-right colors will blend when filling a shape.
* Mirror margins, borders and arrow icons for RTL
This handles everything exception the color picker.
I verified that things like the paint brush and magnifying glass should not be mirrored (even people who read Hebrew are usually right-handed)
* Fix dropdown icon padding in RTL
* Create messages.js for all tooltips as many are shared between the bitmap and vector editors:
* Brush Translation
* Eraser Translation
* Fill Translation
* Line Translation
* Oval Translation
* Rect Translation
* Reshape Translation
* RoundedRect Translation
* Select Translation
* Text Translation
* increased fullsize editor width, English required 1272, adding a couple more pixels allowed a couple of other languages to keep labels
* hide flip vertical/horizonal labels for everything except English
* hide all labels for languages defined in `hideLabel`
