Use Unicode CLDR to create speech symbol dictionaries with emojis (#8758)
* Add emoji dictionaries as a git submodule
* Scons implementation
* Load emoji dictionaries in characterProcessing
* Add speak emoji descriptions entry to settings
* Support multiple emoji sources per locale
* Update emojiDict_sconscript
* Rename emoji dictionaries to cldr
* Cache locales for which no symmbols are available
* Clear CLDR data when saving the option is changed
* Handle config profile switches properly for CLDR data
* Update copyright
* Revert unnecessary change to sconstruct
* User guide
* Remove all eSpeak emoji dictsource files before compiling eSpeak
* Update what's new