v1.8.0

Breaking Changes:

• Added demo for HTGetActiveBackendName().
• Added HTGetActiveBackendName() to get currently active backends.
• Fixed incorrect render of ImGui when the game changes glColorMask.
• Changed gameEditionFlag to int32_t to allow more games.
• Added OpenGL3 backend.
• Added game backend for MCBE Chinese Edition.
• Added HT_ImplNull_EditionAll to ignore edition check.
• Added more backend functions to allow backends to customize game edition check
  and ImGui initialize.
• Use htconfig.h to enable or disable backends.
• Allow customization of game and renderer backend code except for Sky:CotL.
• Transfer all game related and platform related code to the backends folder.

Other Changes:

• Fixed incorrect function name utf8ToWchar in html_impl_vklayer.
• Added HTDataStoreStringKey() and HTDataGetStringKey().
• Added demo for HTDataStore() and HTDataGet().
• Added HTDataStore() and HTDataGet() to save persistent data.
• Introduced LevelDB and ZLib.
• Vulkan layer implementaion will create html-config.json if missing.