Add imported package to workspace, fix for perf issues with linters and outline view, and more bug fixes

• Shannon Wynter @freman

  • New command Go: Add Package to Workspace that will add selected imported package to the current workspace. Feature Request 1733 implemented with PR 1745

• Jackson Kearl (@JacksonKearl)

  • Fix perf issues when using linters. Bug 1775 fixed with PR 1791
  • Improve performance of the Outline view. PR 1766

• Marwan Sulaiman (@marwan-at-work)

  • When suggesting unimported custom packages, show the ones form current workspace before the others. PR 1782

• Halil Kaskavalci (@kaskavalci)

  • Fix bug with function snippets such that they are not inserted when functions are being filling in as parameters of another function call. Bug 1779 fixed with PR 1788

• Matt Strong (@xmattstrongx)

  • Fix bug in debug variable and hover when using multi byte characters. Bug 1777 fixed with PR 1790

• Ramya Rao (@ramya-rao-a)

  • Fix error with Go: Generate Interface Stubs command when using on an interface that is defined inside an "internal" folder.Bug 1769
  • Fix bug where auto-completions dont show built-in types. Bug 1739
  • Look at GOROOT before PATH when looking for the Go binary. Fixes Bug 1760 which was a regression.
  • Clean up the debug binary that gets generated by delve at the end of the debugging session. Bug 1345