* fix several tests that were using akka.remote.netty.tcp config
* replace akka.tcp with akka in more places
* some doc cross references to remoting.md
* Allow for dispatcher aliases and define a internal dispatcher
* Test checking dispatcher name
* MiMa for Dispatchers
* Migration guide entry
* No need to have custom dispatcher lookup logic in streams anymore
* Default dispatcher size and migration note about that
* Test checking exact config values...
* Typed receptionist on internal dispatcher
* All internal usages of system.dispatcher gone through
* One does not "simply"
* It's not obvious
* It's not really _that_ easily done
* Basically is basically a useless word
* Of course - if you already know how things work you wouldn't be reading the docs
* Clearly is maybe not so clear for everyone
* Just was just a bit harder as there are some uses that are just
* Adding additional details to the auto-downing section of the documentation to indicate the consequences of using it
* Slight rewording based on PR feedback.
* Add dependency snippets to relevant doc sections
* Add 'Dependency' headings
Tried to consistently add them to each section introducing a module, after
the introduction but before the first code sample.
* Make Dependency sections more consistent