Merge pull request #12 from Y-Less/master

stack_dump showed slightly too much.
stack_dump: Fix offsets in stack layout diagram
stack_trace: Fix possible buffer overrun
stack_trace: Switch PrintStackTrace() to crashdetect format
Merge pull request #13 from Y-Less/master

Extra import_table functions and fix.
Remove the @, r@, w@, read@ and write@ macros
Mark all occurrences of pointless "return 0" in #emit code
Fix compile warning

stack_trace-test.pwn(12) : warning 235: public function lacks forward declaration (symbol "f1")

stack_trace-test.pwn(20) : warning 235: public function lacks forward declaration (symbol "f3")
Added frame_info.inc for getting greater details on stack frames.