Flag to shorten error output

[Lootwig]

When working on a laptop, my console is usually just 4-6 lines high.

The error output Could not find the correct Provider<X> above this Y Widget is followed by a long chunk of instructions on how to use provider before the stack trace is shown - however, usually these two are the only things I care about as someone who is familiar with the package: what provider I forgot to create, and where it's missing.

I'm happy to contribute on this, I was thinking a global bool Provider.conciseErrors setter would do the trick - any objections?

[rrousselGit]

I'm not fond of the idea.
I don't want to have random configuration flags for such a thing.

But we can improve the message if you have any idea on what could be made better

[Lootwig]

How about an FAQ (or "Frequently Done Wrong") one-liner URL instead? For reference, the current instructions are 45 lines long

[Lootwig]

Alternatively, swap the order of the instructions and the info which provider was missing, so that an auto-scrolling console will have the most relevant info at the bottom:

- [provider how-to...]
- Error: Could not find the correct Provider<$valueType> above this $widgetType Widget
- [Stacktrace]

[rrousselGit]

Maybe we could show the type both at the start and the end.
Having it at the start is important I think.

In any case, I don't care too much about this. Fancy making a PR?