Fix rebuilding of emsdk

Fix #80: Delete emsdk if rerunning make

Update link to recurse center code of conduct

Fix #78: LINT [skip ci]

Safer parsing of expression at end of code block

Don't copy data if already on the WASM heap

Add testing with Chrome

Convert typedarrays to/from buffers/memoryviews

Fix #53: Make "run all" work

Fix the passing of Javascript typed arrays to Python

Add a lot more jsproxy functionality