Integrate full-text search results into title search results

[Jaifroid]

Fixes #930 and #931.

[Jaifroid]

Most of the kinks are ironed out, and this appears to be working pretty well now, both in A-namespace ZIMs, and in C-namespace ZIMs (including Zimit archives, although the content of found Zimit articles is poorly formatted in Kiwix JS of course, because only the HTML is loaded with no CSS of JS).

[Jaifroid]

Example: Full English Wikipedia with full-text search (A-namespace):

[Jaifroid]

Beer Stack Exchange (OpenZim Type 1 ZIM with C-namespace):

[Jaifroid]

And, for fun, Mozilla Development Network, a Zimit-style ZIM (C-namespace):

[Jaifroid]

Needs thorough testing on older browsers and for null searches before merging.

[Jaifroid]

Tests:

• Chromium for Windows - works fine
• Firefox latest for Windows - works fine
• Firefox on Ubuntu - works REALLY SLOWLY, but this may be to do with filesystem emulation on WSL
• Edge Legacy (also UWP app) - BROKEN. The WASM won't compile due to invalid opcodes. Possible solution may be to compile with pthreads disabled -- see failed to asynchronously prepare wasm: CompileError: WebAssembly.instantiate(): Compiling function #67 failed: Invalid opcode 0xfe (enable with --experimental-wasm-threads) emscripten-core/emscripten#13152 (comment)
• Chromium on Android - DOESN'T WORK (probably a similar issue with compiling for too high a target)
• Firefox on Android - works fine (but Firefox on Android isn't usable for large archives because it loads ZIM archives into memory before accessing them)

[Jaifroid]

Now added better API reporting, and updated the binaries, including source code.

[Jaifroid]

Tests need fixing.

[Jaifroid]

Tests:

• Firefox OS - degrades gracefully to title-only search
• IE11 - same
• Firefox Developer 109 - shows FT index results
• Edge Chromium - same
• Firefox Extension - shows FT index results
• Chromium Extension - shows FT index results