Add PlaceholderAPI integration.

[Maroon28]

Closes #5

(Note: Feel free to request any changes to the naming conventions, or any placeholders I missed!)

ADDED PLACEHOLDERS

GLOBAL

Simply returns stats for all arenas combines

%mobarenastats_global_sessions%: Returns global sessions

%mobarenastats_global_seconds%: returns total seconds played... by everyone, everywhere.

%mobarenastats_global_seconds-formatted%: returns total seconds played, but formatted as such HH:MM:SS. I.E 160 seconds formats to 00:02:40

%mobarenastats_global_kills%: returns total kills ever made

%mobarenastats_global_waves%: returns total waves played

ARENA STATS

Returns stats for a specific arena. Must replace with a valid arena name!

%mobarenastats__highest-wave%: Returns highest wave reached in an arena

%mobarenastats__highest-kills%: Returns highest kills in an arena

%mobarenastats__highest-seconds%: returns longest seconds played

%mobarenastats__highest-seconds-formatted%: Like the formatted glboal duration, but per-arena

%mobarenastats__total-kills%: Returns total kills for an arena

%mobarenastats__total-waves%: Returns total waves for an arena

%mobarenastats__total-sessions%: Returns total times the arena was played

%mobarenastats__total-seconds%: returns total seconds arena was played

%mobarenastats__total-seconds-formatted%: returns total seconds arena was played, but formatted in HH:MM:SS.

PLAYER STATS

Returns stats for a player.

%mobarenastats_player_total-sessions%: returns total sessions a player has played

%mobarenastats_player_total-kills%: Returns total kills a player made

%mobarenastats_player_total-seconds%: Returns total seconds a player has played

%mobarenastats_player_total-seconds-formatted%: Returns total seconds a player has played, but formatted as HH:MM:SS

%mobarenastats_player_total-waves%: Returns total waves a player has gone through.

[garbagemule]

Closing this as it is solved via MobArenaPlaceholders :)