Add Visible modes function from Organisation to Users too (#16069)

You can limit or hide organisations. This pull make it also posible for users

- new strings to translte
- add checkbox to user profile form
- add checkbox to admin user.edit form
- filter explore page user search
- filter api admin and public user searches
- allow admins view "hidden" users
- add app option DEFAULT_USER_VISIBILITY
- rewrite many files to use Visibility field
- check for teams intersection
- fix context output
- right fake 404 if not visible

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Andrew Thornton <art27@cantab.net>

routers/web/user/profile.go

@@ -75,6 +75,17 @@ func Profile(ctx *context.Context) {
 		return
 	}
 
+	if ctxUser.IsOrganization() {
+		org.Home(ctx)
+		return
+	}
+
+	// check view permissions
+	if !ctxUser.IsVisibleToUser(ctx.User) {
+		ctx.NotFound("user", fmt.Errorf(uname))
+		return
+	}
+
 	// Show SSH keys.
 	if isShowKeys {
 		ShowSSHKeys(ctx, ctxUser.ID)
@@ -87,11 +98,6 @@ func Profile(ctx *context.Context) {
 		return
 	}
 
-	if ctxUser.IsOrganization() {
-		org.Home(ctx)
-		return
-	}
-
 	// Show OpenID URIs
 	openIDs, err := models.GetUserOpenIDs(ctxUser.ID)
 	if err != nil {