Document other missing filters (rank and countdown, fill action, subtitle typo)

[RuedigerLP]

• <rank> Match if the player or team's rank is within the specified range.

<rank> and <score> can also have an team attribute.

https://docs.oc.tc/modules/filters#rank_score
https://github.com/PGMDev/PGM/blob/dev/core/src/main/java/tc/oc/pgm/filters/parse/FilterParser.java#L539-L543

• <countdown>

https://docs.oc.tc/modules/filters#countdown
https://github.com/PGMDev/PGM/blob/dev/core/src/main/java/tc/oc/pgm/filters/parse/FilterParser.java#L519-L527

• <fill> Fill action

https://github.com/PGMDev/PGM/blob/dev/core/src/main/java/tc/oc/pgm/action/ActionParser.java#L283-L290

• subtitle attribute of <message> action is called subtitle and not text.

https://github.com/PGMDev/PGM/blob/dev/core/src/main/java/tc/oc/pgm/action/ActionParser.java#L225

• spread-teammates attribute of spawn Spawn players as far away as possible from any players, event teammates.

• <holding/>, <carrying/> and <wearing/> are dynamic filters.

• exposed If true an action can be triggered using /action trigger [action]

PGMDev/PGM#1102

[CoWinkKeyDinkInc]

PGMDev/PGM#1138 and
PGMDev/PGM#1149 have also been documented.

[CoWinkKeyDinkInc]

All of these have been added. Thanks so much for linking all the relevant information!