PLT-4332 Position field for Users (#4632)

* Add User.Position field to store & model.

* GOFMT

* Add Position to user settings.

* Unit tests.

* Add position to profile popup.

* i18n

* Fix log message for invalid position.

* Add Position field attribute to LDAP config.

* Add Position field attribute to SAML config.

* Reword empty position message.

* Change Position Max Length to 35.

* Better invalid position error message.

* Add new fields to config.json.

* Ensure position is never longer than max when displayed.

* Hard limit of 64 chars with soft limit still 35

* Put field with other attributes.

store/sql_upgrade.go

@@ -222,6 +222,9 @@ func UpgradeDatabaseToVersion36(sqlStore *SqlStore) {
 	// Create Team Description column
 	sqlStore.CreateColumnIfNotExists("Teams", "Description", "varchar(255)", "varchar(255)", "")
 
+	// Add a Position column to users.
+	sqlStore.CreateColumnIfNotExists("Users", "Position", "varchar(64)", "varchar(64)", "")
+
 	//saveSchemaVersion(sqlStore, VERSION_3_6_0)
 	//}
 }