* Add simple unit tests for SymbolSizeBinder
* Fix bug in symbol size uniform value calculation
For camera functions we were setting the zoom levels in "covering ranges" to
`[(zoom stop <= tile zoom), (zoom stop >= 1 + tile zoom)]`, but then evaluating
the function at `[tile_zoom, tile_zoom + 1]`.
* Check for it != end() before accessing it->first
b5b4549 / #8613 handled the edge case for layout properties, but not paint properties. Move the check for a degenerate range to interpolationFactor in order to handle both correctly.
* Update gl-js and generate style code
* Factor out packUint8Pair() helper function
* Draft implementation of DDS for {text,icon}-size
Ports https://github.com/mapbox/mapbox-gl-js/pull/4455
* Fix text-size/composite-function-line-placement test
* Refactor to PaintPropertyBinders-like strategy
* Dedupe gl::Program construction
* Use exponential function base for interpolation
* Dedupe coveringZoomStops method
* Fixup tests
* Fix CI errors (hidden within #if block)
This fixes a bug where, for a zoom value greater than that of the highest zoom
stop, composite function interpolation would return nan. (Blocking a render
test over in #8593)
* Add failing tests for composite function edge case
The failing cases here are:
- Should interpolate before the first stop
- Should interpolate past the last stop
* Fix edge case in composite function interpolation
* Hold functions constant outside stop-defined domain
