Explicitely set map interactions

[thekid]

This pull request revises the solution found in #64 which also prevents moving the map using touch without previously having to focus the map (e.g. by touching it or clicking) and overwriting the default map interactions (see below) as follows:

Touch

• Swipe to move
• Pinch to zoom

Mouse / trackpad

• Ctrl + mouse wheel to zoom (default: mouse wheel zooms)
• Drag to move

Rotating the map is disabled.

Keyboard (on focus)

• Arrow keys to pan
• + and - to zoom in and out

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The default set of interactions, in sequence, is:

• DragRotate
• DoubleClickZoom
• DragPan
• PinchRotate
• PinchZoom
• KeyboardPan
• KeyboardZoom
• MouseWheelZoom
• DragZoom

See https://openlayers.org/en/latest/apidoc/module-ol_interaction_defaults

[thekid]

@kiesel can you verify this still works as expected for you with the mouse scrolling?

[kiesel]

This now works as expected!