0.8.4 Fixes + Molten rework

Changes:

1. Rewritten the entire molten network logic. Now it uses two layered net approach to simulate actual molten iron flow. Existing molten metals inside canals will desappear after this change, so drain your canals before updating!
2. (funions123) Added extension system for iron ore. IndustrialStory compatibility.
3. Changed the default values for the cowperstove to be more forgiving (Delete your VintagestoryData/ModConfig/smex.json to restore defaults.)
4. Changed default flow values to achive proper molten flow effect. (Delete your VintagestoryData/ModConfig/smex.json to restore defaults.)
5. Raised default bessemer temp to increase the solidification timing to 3m.
6. Made canals with molten metal light sources.

Fixes:

1. Fixed handbook article formatting.
2. Made the converter tilt more slow.
3. Bessemer converter not adhering to global melting config.
4. Fixed animation for wrench rotated valves.
5. Fixed rendering for molten serfaces not chaning with temperature in some cases.
6. Removed being able to chisel out non-hardened metal.
7. Fixed converter not respecting input tap state.
8. Fixed taps and pedestals not actually severing network connection when closed.
9. Fixed valves using incorrect interaction sound.