Add extra number field to Experience to track total XP

[tak5haka]

Would it be possible to add an extra number field to the Experience block on the PC actor sheet so that total XP can be tracked in addition to the current number of available XP? This would make it easier for GMs and Players to understand when they are able to gain promotions, medals, etc rather than keeping track externally.

[tak5haka]

Something like this?

Add at line 91 of templates/actor/parts/actor-header.hbs

/ <input class="num-short-3" type="number" min="0" name="system.xp.total" value="{{system.xp.total}}">