Deservicify core (#2458)

* De-servicify router (mostly)

Still uses the redraw service, but it no longer has an intermediate
service of its own.

Also, did a *lot* of test deduplication in this. About 30-40% of the
router service tests were already tested on the main router API instance
itself.

Bundle size decreased from 9560 to 9548 bytes min+gzip.

* Merge `m.mount` + `m.redraw`, update router

Simplifies the router and redraw mechanism, and makes it much easier to
keep predictable.

Bundle size down to 9433 bytes min+gzip, docs updated accordingly.

* Make `mithril/render` just return the `m.render` function directly.

* Deservicify `m.render`, revise `m.route`

- You now have to use `mithril/render/render` directly if you want an
  implicit redraw function. (This will likely be going away in v3.)
- Revise `m.route` to only `key` components

* Add `redraw` to `m.render`, deservicify requests

* Test error logging

* Update docs + changelog [skip ci]

index.js

@@ -1,22 +1,19 @@
 "use strict"
 
 var hyperscript = require("./hyperscript")
+var request = require("./request")
+var mountRedraw = require("./mount-redraw")
+
 var m = function m() { return hyperscript.apply(this, arguments) }
 m.m = hyperscript
 m.trust = hyperscript.trust
 m.fragment = hyperscript.fragment
-
-var requestService = require("./request")
-var redrawService = require("./redraw")
-
-requestService.setCompletionCallback(redrawService.redraw)
-
-m.mount = require("./mount")
+m.mount = mountRedraw.mount
 m.route = require("./route")
-m.render = require("./render").render
-m.redraw = redrawService.redraw
-m.request = requestService.request
-m.jsonp = requestService.jsonp
+m.render = require("./render")
+m.redraw = mountRedraw.redraw
+m.request = request.request
+m.jsonp = request.jsonp
 m.parseQueryString = require("./querystring/parse")
 m.buildQueryString = require("./querystring/build")
 m.parsePathname = require("./pathname/parse")