PLT-1527 Add a slash command to set yourself away (#3752)

* added handlers for slash commands

* added manual status persistance

* added tests

* removed extra debug output and comments

* rebase - fixing the PR

* making echo messages after slash commands ephemeral

store/sql_status_store_test.go

@@ -4,14 +4,15 @@
 package store
 
 import (
-	"github.com/mattermost/platform/model"
 	"testing"
+
+	"github.com/mattermost/platform/model"
 )
 
 func TestSqlStatusStore(t *testing.T) {
 	Setup()
 
-	status := &model.Status{model.NewId(), model.STATUS_ONLINE, 0}
+	status := &model.Status{model.NewId(), model.STATUS_ONLINE, false, 0}
 
 	if err := (<-store.Status().SaveOrUpdate(status)).Err; err != nil {
 		t.Fatal(err)
@@ -27,12 +28,12 @@ func TestSqlStatusStore(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	status2 := &model.Status{model.NewId(), model.STATUS_AWAY, 0}
+	status2 := &model.Status{model.NewId(), model.STATUS_AWAY, false, 0}
 	if err := (<-store.Status().SaveOrUpdate(status2)).Err; err != nil {
 		t.Fatal(err)
 	}
 
-	status3 := &model.Status{model.NewId(), model.STATUS_OFFLINE, 0}
+	status3 := &model.Status{model.NewId(), model.STATUS_OFFLINE, false, 0}
 	if err := (<-store.Status().SaveOrUpdate(status3)).Err; err != nil {
 		t.Fatal(err)
 	}
@@ -80,7 +81,7 @@ func TestSqlStatusStore(t *testing.T) {
 func TestActiveUserCount(t *testing.T) {
 	Setup()
 
-	status := &model.Status{model.NewId(), model.STATUS_ONLINE, model.GetMillis()}
+	status := &model.Status{model.NewId(), model.STATUS_ONLINE, false, model.GetMillis()}
 	Must(store.Status().SaveOrUpdate(status))
 
 	if result := <-store.Status().GetTotalActiveUsersCount(); result.Err != nil {