Faster Happy Ghast

# Changelog - **Configurable speed**: The speed is now configurable by a scoreboard (only op players can change that).  The option has 3 level of speed:   - 1: `0.075`
  - 2: `0.1`   - 3: `0.125 `   The option is configurable through this command ``` /scoreboard players set &speed fgh.config <1,2,3> ```