Custom title commands.

[NJDaeger]

Create commands like

• ./bossbar {color} {timespan} [percentageFilled] {message}

• Ex. /bossbar red 10:s 50% Hi there

• ./title {timespan} {message}

• Ex. /title 15:s Hi there

• ./subtitle {timespan} {message}

• Ex. /subtitle 15:s Hi there

Going to use ElDoggo's DisplayAPI: https://github.com/ElDoggo/DisplayAPI