Add compatibility with CodeChickenCore coremod lava tweak. Fixes #656, #1291, #1307

CodeChickenCore's "persistantLava=false" option (note: the default is
persistantLava=true, as to not modify vanilla behavior) edits BlockFlowing
to change flowing lava blocks to decay similarly to flowing water blocks.
This tweak would fail on MCPC+ as the coremod was unable to find the
'needle' pattern in the bytecode.

This occurred due to the CraftBukkit edit at the top of updateTick(),
shifting local variable indices and therefore unexpectedly altering
the bytecode patterns from CCC's perspective.

Move CB's new variable declarations to after vanilla's, therefore preserving
the required needle for CCC. With this change, TweakTransformer is
now able to find the "i1 = l; flag = false;" pattern and the
persistantLava=false option in config/CodeChickenCore.cfg behaves as expected.
(Note you can use bukkit.yml flowing-lava-decay:false as an alternative in
MCPC+ without CodeChickenCore, as before -- either option will work.)