Fix some issues with the current state of the mod

- Make HoG more expensive to make
- Make HoG damage values work properly.
- 1 Power unit is now 200 MJ. (May require future tweaking)
- HoG now requires 16 Units per use, and can store 1600 Units.
- Charger now holds up to 10000 MJ / 50 units, and accepts 200 MJ/t.
This power is lost if block is broken or unloaded.
More balance tweaks

Heart of Gold Default (16 Units) now only restores hunger.
Heart of Gold Hi-Power (528 Units) now restores more hunger, grants
regeneration for a short period and grants longer fire resistance and
resistance effects. Sneak to activate. Does not stack.