Memory clone function wasn't able to write to new reserved memory object.
Changed so allocating Memory objects with protection flag allocates commited memory.
* Add local_function field to context
* Add local call indirection to llvm
* local call indirection
* Fix vm test
* Fix cranelift local call indirection
* Fix unwinding on nightly
* remove exception handler when function returns or throws
* revert to only reserving and not committing memory due to issues
* appveyor builds for release, caches more, only publish artifact once
* Allow a module to have a different signature registry than the process-specific
* Add core ability to build compiled code caches
* Remove timing printouts
* Serialize/Deserialize memories to reduce copies
* Work more on api
* Relocate local functions relatively before external functions
* Fix incorrect definition in test
* merge errors caused by merge
* Fix emscripten compile
* Fix review comments
* Move wasmer-runtime to wasmer-runtime-core
* Add the runtime library
* Fix issue with macros using wasmer_runtime, fmt
* Make default compiler dependency optional
* Add instantiate and validate functions
