Show error information when hovering over line

[Kyu]

Wanted Behaviour

An option to allow tooltips to display error information on hover. e.g like it does for function definitions

Also referenced in #688 #752

Actual Behaviour

I either have to enable phantoms, or click the offending line and check the status bar for error info.

Steps to Reproduce

Enter syntax incorrect python code into the window with "anaconda_linter_phantoms" set to true. (side note, phantoms don't disappear when you set them to false, I have to restart sublime)

ST3, Anaconda and OS versions

3.2.2 Build 3211. Anaconda 2.1.36, Windows 10 64-bit

ST3 Console Logs

Anaconda's JsonServer Logs

Note: Anaconda's JsonServer logs can be found in:

• Linux: ~/.local/share/anaconda/logs
• OS X: ~/Library/Logs/anaconda
• Windows: %APPDATA\Anaconda\Logs

Making this issue because the Readme said to make an issue before making a PR. I'd also like to work on a PR for this issue.