NETOBSERV-244 Topology Export

[jpinsonneau]

This PR adds to topology an export button with simple svg to png conversion. This is a first step as a quick win until we develop other export formats.

Action button:

Downloaded file:

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[mariomac]

Is is possible to put this file in a subfolder instead of the root web folder?

[jpinsonneau]

As far as I see we need an index.d.ts file in root web folder that imports others definitions files from anywhere and then export them.
For now we only have this one.

Would it be ok for you if I add this index.d.ts file in root and put save-svg-as-png.d.ts in a new types folder ?

[mariomac]

yeah, it's Ok. Not a big problem from my side if you think it's better to keep the save-sgv-as-png file in the web folder, if you think its a common/good practice for this kind of projects.

[jpinsonneau]

at the end there is already a typedefs folder for protocol-numbers @mariomac so I moved save-sgv-as-png to that folder

[mariomac]

LGTM. A minor (I think) issue that I think it could be addressed into another PR: the fonts of the exported SVG (serif) are different from the UI fonts (sans-serif).