C#: Re-work solution build output panel

- Removed item list that displayed multiple build
  configurations launched. Now we only display
  the last build that was launched.
- Display build output next to the issues list.
  Its visibility can be toggled off/on.
  This build output is obtained from the MSBuild
  process rather than the MSBuild logger. As such
  it displays some MSBuild fatal errors that
  previously couldn't be displayed.
- Added a context menu to the issues list with
  the option to copy the issue text.
- Replaced the 'Build Project' button in the panel
  with a popup menu with the options:
  - Build Solution
  - Rebuild Solution
  - Clean Solution
- The bottom panel button was renamed from 'Mono'
  to 'MSBuild' and now display an error/warning icon
  if the last build had issues.

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