Dispatcher: add addCurrentLocationToStack

[yparitcher]

This is useful when i want to reference something a few pages away while keeping track of my current page

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This change is 

[poire-z]

May be add a notification so you're sure you didn't fail your gesture ? :) as in 7bae2ed

And the day you are bored (noticed that in #10370):

Note: in dispatcher.lua, the action definitions (with separators) and the ordering are in 2 different lists, and their ordering is different, which makes it tedious to properly update and figuring out where to insert/update separators.

[yparitcher]

Added a notification.

Reorded the dispatcher items, with the exception that the items parsed from CreOptions and KoptOptions are grouped separately.

Ready on my end

[poire-z]

Thanks for the list reordering :)