Added the under-the-hood code to support customisation of ...#32

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x0rloser wants to merge 2 commits intosigrokproject:masterfrom x0rloser:customisable_navigation

+1,156-22

Commits on Sep 20, 2020

Added the under-the-hood code to support customisation of keys/mousewheel used to navigate the traces such as for multiple levels of moving and zooming.
xorloser
committed

Commits on Sep 23, 2020

Finished customised navigation by adding GUI support for setting the customisations
xorloser
committed