:lipstick: Upgrade deprecated methods.

- Fix require statements.
- Fix package.json for space-pen.
- Use new atom.commands.
- Use new atom.views.getView(atom.workspace).
- Use new atom.workspace.observeTextEditors.
- Use editorView.hidden.
- Use new config schema.
- Use new activationCommands format.
- Change spec tests to set height and width of worspaceElement.
- Update most of the tests to use the querySelector instead of jQuery
  stuff.
- Pass 1 test with 0 deprecations.
- TODO: More to follow.