Add GlobalSwitches element to head of map
Add GlobalSwitches element to head of map

Gives ability to set Leaflet's global switches:
- prefer_canvas: Forces Leaflet to use the Canvas back-end (if
available) for vector layers instead of SVG
- no_touch: Forces Leaflet to not use touch events even if it detects
them
- disable_3d: Forces Leaflet to not use hardware-accelerated CSS 3D transforms for
positioning (which may cause glitches in some rare environments) even if
they're supported

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