fishing.lua - fixes and improvements

added ice hole support
added sandfish fishing
extra fishing(buff or eq) is now considered
removed comparision with boolean
used metatables
Update fishing.lua

added water elemental corpses
formulas closer to rl
more ice fishing improvements
item userdata (+targetItem is called a bit faster than itemEx.itemid)
fishing lua - further improvements

more metatables
moved local variables below
Merge pull request #625 from Faith2531/master

fishing.lua - fixes and improvements