Use npm svg-pan-zoom instead of embedded one

[emeric254]

Todo list :

• find which version of svg-panzoom is currently used by this project
• add svg-pan-zoom to this project dependencies (package.json)
• test svg-pan-zoom new releases does not break anything

I'll try to come up with a PR to work on that

[emeric254]

Ok seems there was no changes on svg-pan-zoom since 2019 so we're good in that way
(bumbu/svg-pan-zoom#395 and https://github.com/bumbu/svg-pan-zoom/releases)

[gr1m1um]

Hey, svg-pan-zoom is a customized version, that's why its embed.
I can't remember the changes but includes some global variables exposure and event changes so they can be intercepted/cancelled, possibly others, svg-pan-zoom is not ideal and the code its old but its quick to setup and use.

[emeric254]

Ok no problem good to know 👍