Fix source debugging issues (#776)

- fix data race issue between debug control thread and main thread
- fix possible memory leaks in breakpoints list
- fix memory uninitialized issues
- remove unused data structures
- add more checks when handling packet and args
- fix mini-loader issues
- fix config_common.cmake fast interp prompt issue

build-scripts/config_common.cmake

@@ -145,7 +145,7 @@ elseif (WAMR_BUILD_LIBC_WASI EQUAL 1)
 else ()
   message ("     Libc WASI disabled")
 endif ()
-if (WAMR_BUILD_FAST_INTERP EQUAL 1)
+if ((WAMR_BUILD_FAST_INTERP EQUAL 1) AND (WAMR_BUILD_INTERP EQUAL 1))
   add_definitions (-DWASM_ENABLE_FAST_INTERP=1)
   message ("     Fast interpreter enabled")
 else ()