Add my plugin Expander

[Eluwer]

Adds Expander to the Plugin Hub.

Features:

• Set and persist an origin tile.
• Expand or reduce the unlocked area.
• Show the current expansion level and unlocked tile count.
• Draw a boundary around the unlocked area.
• Mark the origin tile.
• Add personal objective and backlog notes.
• Optional sounds for expanding, reducing, setting the origin, and leaving the
  unlocked area.

Complies with Jagex third-party client guidelines.
No automation or gameplay decision-making.

Screenshot:

[runelite-github-app]

New plugin expander: https://github.com/eluwer/expander/tree/eb0f37a4a36346d7102fbf8a1737cc845aa2de28

[riktenx]

doesn't build