Improve hover presentation for complex errors

[mjbvz]

Error hover is good in representing simple errors. But when it comes to complex and descriptive errors, inline error widget can represent them well. But inline error widget is not discoverable.

• Ability to navigate to inline error widget from hover.
• Make hover look good with consistent font for the complete message.

[jrieken]

/cc @misolori The idea is to add some clue into the error hovers so that we can hint towards the F8 feature - which is more stable and provides a better reading experience with long error messages

[sandy081]

Johannes Rieken (@jrieken) Was there a reason for applying editor font in the hover error message? Currently editor font is applied only for message and not for related information.

[sandy081]

Did following improvements

• Used default font
• Increased the width
• Added Go to Problem and Show Quick Fixes... actions
• Improved related information rendering

Matt Bierner (@mjbvz) @misolori Johannes Rieken (@jrieken) What do you think?