Admin UI to control number of workflow transition buttons that are visible

Currently to change the default value (2) of number of workflow transition buttons that are visible on an issue screen, it is necessary to add/update the paramater "ops.bar.group.size.opsbar-transitions" in the file "jira-config.properties" in the JIRA home directory.

Workflow transitions that have an "opsbar-sequence" property applied will show up in the transition button bar (<div class="toolbar-split toolbar-split-left") based on the property value (priority) - until the number of buttons hit the max set by the ops.bar.group.size.opsbar-transitions parameter; all additional transitions (with or without an opsbar-sequence property) will then be listed in the "Workflow" overflow drop down.

This new feature request is to provide an admin web UI (Admin > System > User Interface > Look and Feel) to set the ops.bar.group.size.opsbar-transitions value.

Changing the ops.bar.group.size.opsbar-transitions value will require a stop / restart of JIRA. The admin UI should also contain a simple "restart" button.