Moves GitLens to the scm activity 🎉

CHANGELOG.md

@@ -11,6 +11,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 - Adds an icon for the *Compare File with Next Revision* command (`gitlens.diffWithNext`) and moves it into the editor toolbar
 
 ### Changed
+- Moves the *GitLens* explorer, *GitLens History* explorer, and *GitLens Results* explorer under the Source Control activity (in the sidebar) 🎉 — closes [#213](https://github.com/eamodio/vscode-gitlens/issues/213)
 - Renames *Compare Line Revision with Previous* command (`gitlens.diffLineWithPrevious`) to *Compare Commit with Previous* for consistency with other commands
 - Renames *Compare Line Revision with Working File* command (`gitlens.diffLineWithWorking`) to *Compare Commit with Working File* for consistency with other commands
 - Renames *Show Commit File Details* command (`gitlens.showQuickCommitFileDetails`) to *Show Commit Details* for consistency with other commands

package.json

@@ -493,7 +493,7 @@
                 },
                 "gitlens.historyExplorer.enabled": {
                     "type": "boolean",
-                    "default": false,
+                    "default": true,
                     "description": "Specifies whether to show the current file history undocked in a `GitLens History` explorer",
                     "scope": "window"
                 },
@@ -2961,7 +2961,7 @@
             }
         ],
         "views": {
-            "explorer": [
+            "scm": [
                 {
                     "id": "gitlens.gitExplorer",
                     "name": "GitLens",