Fix WASM runtime audio, JPEG decoding, device fonts, and loadMovie ordering

[ClausValcaTD]

Fix WASM runtime audio playback, JPEG image loading, missing device font glyphs, and loadMovie event ordering.

• Implement sound_handler_wasm in src/wasm_api.cpp to stream PCM samples into AudioMixer
• Enable -sUSE_LIBJPEG=1 and TU_CONFIG_LINK_TO_JPEGLIB=1 in CMakeLists.txt for WASM
• Implement glyph_provider_wasm in src/gameswf_render_wasm.cpp to handle missing Japanese/device fonts
• Defer onEnterFrame execution for sibling clips during loadMovie in gameswf_sprite.cpp/h
• Refine tu_timer.cpp time_t guards for Windows/Emscripten build compatibility

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PR created automatically by Jules for task 13552641178702591574 started by @ClausValcaTD

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