Enable setting external memory space for wasm app, the feature is disabled by default;
Remove wasm_application_exectue_* APIs from wasm_export.h which makes confused.
* Implement memory profiler, optimize memory usage, modify code indent
* Implement memory.grow and limit heap space base offset to 1G; modify iwasm build type to Release and 64 bit by default
* Add a new extension library: connection
* Fix bug of reading magic number and version in big endian platform
* Re-org platform APIs: move most platform APIs from iwasm to shared-lib
* Enhance wasm loader to fix some security issues
* Implement memory profiler, optimize memory usage, modify code indent
* Implement memory.grow and limit heap space base offset to 1G; modify iwasm build type to Release and 64 bit by default