WIP: Source maps to ease debugging

[forderud]

On the final binary, I also have those:

target_link_options(AFIRunner PRIVATE "SHELL:-gsource-map")

target_link_options(AFIRunner PRIVATE "SHELL:-gseparate-dwarf=${CMAKE_CURRENT_BINARY_DIR}/AFIRunner.debug.wasm")

That enables source maps support, usable even on release. That actual gives c++ style stack traces on errors / exception. So I found it pretty usefull