Move setting up URL listeners into reg-fx

[madvas]

Those side effects should be done in reg-fx and called as regular re-frame events.

name-bazaar/src/name_bazaar/ui/core.cljs

Lines 40 to 43 in bb040c7

	(if history/hashroutes?
	(set! (.-onhashchange js/window)
	#(dispatch [:district0x/set-active-page (d0x-ui-utils/match-current-location constants/routes)]))
	(history/start! constants/routes))

But why?

The problem is that (history/start! constants/routes) fires [:active-page-changed] even before app is bootstrap, therefore before :district0x/smart-contracts-loaded. This causes error, because :active-page-changed assumes :district0x/smart-contracts-loaded.
Currently I used little hack to avoid error:

name-bazaar/src/name_bazaar/ui/events.cljs

Lines 145 to 146 in bb040c7

	(when (all-contracts-loaded? db) ;; Pushstate URLs fire first event too early
	(route->initial-effects (:active-page db) db))

So make it an re-frame event that's fired here at bootstrap

name-bazaar/src/name_bazaar/ui/core.cljs

Line 50 in bb040c7

:dispatch-n [[:district0x/watch-my-eth-balances]

For (.-onhashchange js/window) we already have district0x.ui.window-fx file, you can put new reg-fx there.
For (history/start! constants/routes) you can create district0x.ui.history-fx. Don't put into district0x.ui.history because this file is required many times, so reg-fx is not overwritten every time.