add goal

engine-v5.txt

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+engine-v5 is another cocos2d-x fork.
+
+preprocessor: 
+del: 
+CC_STATIC
+
+add:
+_USRDLL
+_USEGUIDLL
+_USREXDLL
+_EXPORT_DLL_
+
+_USRSTUDIODLL
+
+Refactor core & extensions libs
+C++17
+
+engine-v5-core.dll:
+  renderer, audio, node tree
+  1. Refactor audio engine, OpenAL for all platforms.
+  2. Remove SimpleAudio
+  3. Remove offthread file operation
+  4. Remove getSutiableOpen
+  5. Optimize CCDownloader, curl for all platforms
+  7. Refactor engine-v5-deps, all compile as vs2019 14.22
+  8. minizip-1.2.0 [done]
+  9. ccMessageBox [done]
+  10. BMP support with stb_image
+  11. Remove unused libuv
+  12. Reorder child support
+  13. Remove tinyxml2 dep, use pugixml instead
+  14. Use xsxml for SAX parser only
+  15. Multi meta textures
+  16. ProgramStateRegistry
+  17. Optimize CCFileUtils
+  18. ANGLE support.
+  19. Use curl for HttpClient all platforms
+  20. AES encrypt system
+  21. Remove xxtea
+  XX1. Cache ProgramState or use object_pool
+  XX2. Remove socket.io
+  XX2. Remove websockets
+  XX4. Fully streaming play for all media file: .mp4, .mp3, .ogg, .wav
+  XX5. Streaming load for .ttf with freetype2
+  XX6. Remove CCB(already removed in v4)
+  XX7. Purely offthread load texture, use shared gl context
+
+engine-v5-ui.dll: The original v3-ui framework may remove in the future
+engine-v5-ext.dll: old GUI ui(could be remove), physics-nodes, pu3d
+engine-v5-ccs20.dll: x-studio
+engine-v5-ccs21.dll: x-studio
+engine-v5-xs.dll: x-studio
+
+engine-v5-lua.lib:
+  Lua53 compat
+  Remvoe luasocket
+  Use yasio as external lua/native tcp/udp/kcp support
+  XX1: Use sol2 for binding framework instead tolua++
+
+!!! Custom APK support, don't compress .mp4, .mp3, .ogg, .wav, .ttf
+
+!!!! future of future, use bgfx for multi renderer backend support.