Refactor some stuff

[panleone]

Abstract

A bit of refactor, I suggest to review commit by commit

• first commit: remove the wallet from the network constructor;
• second commit: add a use_network.js class, intermediate between VUE and .js logic
• third commit: use the new composable class in place of importing the global network class
• fourth commit: clean up unused imports and a function in global.js
• fifth commit: get rid of the global block count in Activity.js

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[Duddino]

other than that nit should be good to merge

[Duddino]

Either watch the variable and change explorer or set is as read only.

[JSKitty]

openExplorer was used by the Governance Tab for opening addresses, it'll need replacing with something (until use_network.js can be used with Duddino's Vue Governance port)

[panleone]

openExplorer was used by the Governance Tab for opening addresses, it'll need replacing with something (until use_network.js can be used with Duddino's Vue Governance port)

nice catch, I don't know why I thought it was unused