Add zoom gesture, tile stroke and dialog button text colors - #202
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A pinch gesture zooms the palette in and out and a two finger drag moves the zoomed palette, so tiny color spots of an image can be picked more precisely. A single touch still selects a color as before. The gesture is disabled by default and works with only a bitmap palette, not with the default HSV palette. Closes #48
The painted color isn't distinguishable when the background has the same color, so AlphaTileView can draw a stroke on its edge now. Closes #119
The buttons of the dialog are created when the dialog is shown, so the text colors are applied on showing. Also updates the ABI dump file. Closes #120
Replaces the findViewById calls of MainActivity and adds a Zoom menu for demonstrating the new zoom gesture. Closes #199
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Adds an opt in pinch to zoom gesture for bitmap palettes, so tiny color spots can be picked precisely (#48).
Adds a stroke option to AlphaTileView for separating the painted color from the background (#119).
Adds positive, negative and neutral button text colors to ColorPickerDialog.Builder (#120).
Migrates the demo app to ViewBinding and adds a Zoom menu for the new gesture (#199).