allow for status fields for monsters and player characters

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It would be useful to have a status field for each creature in the initiative tracker, where it can be specified how long the status will last:

• When adding a status, it should be possible to type and get the most common ones (stunned, paralysed etc.) and enter the number of rounds that the status will be active (or permanent until removed).
• When cycling through a combatant with a status, the number of remaining rounds of the status should be decreased.
• Once this hits zero, it should then be displayed in grey indicate that it has expired, after which it can be clicked to remove it from the interface, without any confirmation.
• A status that has not yet hit zero or that is permanent can also be removed by clicking it, in this case a confirmation should be asked.