Added a read and write method to NetworkTile class

Should allow networks that extend this to read and write data from there
tiles when its called. Mainly used to store important info in tiles
while merging or splitting a network. However, it is used by
NetworkFluidTiles class in FM for reading/writing fluid volumes to the
tiles.
Worked on fill method in FluidHelper class
Added IPowerLess interface

Mainly worthless but is used to make it easier for other classes to
check if a tile runs without power. Example is in NetworkSharedPower
class were it need to check for to see if it can run power less based
off it network parts.