Fix some placeholders showing incorrect data#19

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DeathRealms wants to merge 4 commits intoPlaceholderAPI:masterfrom

DeathRealms:master

Commits on Aug 12, 2020

Fix "time_played" and "time_since_death" placeholders
DeathRealms
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Commits on Aug 13, 2020

Fix some placeholders being doubled on non-legacy versions
DeathRealms
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Commits on Aug 14, 2020

Ignore material "BURNING_FURNACE" for legacy versions
DeathRealms
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Commits on Aug 28, 2020

Put the formatTime method from PlaceholderAPI in here
DeathRealms
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