User settings

[ZakShearman]

For both preference and performance reasons, allow users to change some settings.

Settings to change:

• [x] Show damage indicators
• [x] Show raw HP or % HP
• [x] Change fly speed
• [x] Thinner particles - We can make the distance between particles doubled
• [x] Make configurable via GUI

Storage methods:

• [x] JSON
• [x] MongoDB