Minor pass pipeline improvements (AssemblyScript#1424)

fix: Fix asc entry path issue on Windows incl. test (AssemblyScript#1419

)

fix: Keep resolving queued imports while there is progress (AssemblyS…

…cript#1415)

fix: Rebuild with known version before publishing (AssemblyScript#1414)

fix: Fix asconfig merge order (AssemblyScript#1406)

fix: Bundle specific shims with asc instead of relying on defaults (A…

…ssemblyScript#1405)

fix: Fix assertion when a class extends and implements (AssemblyScrip…

…t#1403)

fix: Preliminary path.relative workaround (AssemblyScript#1399)

feat: Implement first-class functions (AssemblyScript#1384)

BREAKING CHANGE: Functions are now represented by a managed `Function` object, and are no longer just function table indexes under the hood. As such, returning a function reference to JS now returns a memory address. External functions imported as part of the function table can be called by index with the re-added `call_indirect` builtin, but typical AS functions must now be called idiomatically.

fix: Respect outFile when detecting no output in asc (AssemblyScript#…

…1391)