Move towards simpler scheduler and synchronous app initialization

Stop delaying all tasks by a setTimeout.

Stop having a special case for if there is a specific bug in the
scheduler.

Stop counting numSteps of tasks reductions. The limit was high enough
that I suspect very few folks reached it, and I’m not sure it’s the
right way to approach this in browsers.

It may make sense to revive it with some mechanism for “low priority”
tasks that could be done with requestIdleCallback and timeRemaining

Create the app thread and effect manager processes synchronously. This
avoids the need for the starter queue for incoming ports. It also makes
the code for creating the main thread a bit clearer.

hints/10.md

@@ -9,8 +9,8 @@ If you let their support team know about this error, please give them a link to
 
 ## Info for Developers
 
-Your application is triggering a bug in the `Task` module of this library! The root cause may be in your code or in a dependency.
+Your application is running into a bug in `elm-lang/virtual-dom` at some point. The root cause may be in your code or in a dependency.
 
-Try to reproduce the issue in dev mode. From there, create an [SSCCE](http://sscce.org/) that reproduces the issue and report it [here](https://github.com/elm-lang/core/issues) with a title like “Scheduler bug: ...” and a description that explains your understanding of the problem.
+Try to reproduce the issue in dev mode. From there, create an [SSCCE](http://sscce.org/) that reproduces the issue and report it [here](https://github.com/elm-lang/virtual-dom/issues) with a title like “Implementation bug: ...” and a description that explains your understanding of the problem.
 
 Hopefully that helps!

src/Elm/Kernel/Error.js

@@ -61,17 +61,13 @@ function _Error_throw__DEV(identifier, fact1, fact2, fact3, fact4)
 			throw new Error('Ran into a `Debug.crash` in module `' + moduleName + '`\n\nThis was caused by the `case` expression ' + _Error_regionToString(region) + '.\nOne of the branches ended with a crash and the following value got through:\n\n    ' + __Debug_toString(value) + '\n\nThe message provided by the code author is:\n\n    ' + message);
 
 		case 10:
-			var tagName = fact1;
-			throw new Error('Scheduler failed on unknown task ' + tagName);
+			throw new Error('Bug in https://github.com/elm-lang/virtual-dom/issues');
 
 		case 11:
 			throw new Error('Cannot perform mod 0. Division by zero error.');
 
 		case 12:
 			throw new Error('Internal red-black tree invariant violated');
-
-		case 13:
-			throw new Error('Bug in https://github.com/elm-lang/virtual-dom/issues');
 	}
 }