patch-release
wasm/fiddle refactoring part 1 of N: move fiddle app from ext/fiddle to ext/wasm/fiddle, which only contains files intended to be pushed to the live site. Disabled build of the non-fiddle wasm parts, pending a later step of the refactoring.
Fix part 2 of 2 for /fiddle: a make deps problem which caused fiddle to load but fail to run when sqlite3.c was missing.
Finish eliminating explicit Emscripten module dependencies in test code and fiddle. The only remnant in public code is the Emscripten-generated module load/init interface.
Rename fiddle.html to index.html and move fiddle push-to-server rules from GNUmakefile into fiddle.make.