Implemented more JIT opcodes and other things.

Now it compiles the standard library correctly, also each example given
with SScript Editor is compiled and works perfectly <3
Well, I lied - it almost perfectly compiles stdlib - there're just two
more things to do:
1) "acall" opcode (currently it's just a dummy opcode doing nothing).
2) exception handling (I have no freaking idea, how I'm going to do this
one)