Obey library loading state and add modifiers only where needed #199
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This is a strict subset of my other pull request, which also adds support library span handling. The purpose is to simplify the review process and to separate concerns.
It addresses two issues
EmojiCompat span replacement routines are now only called when the library is ready. Before, an exception might be thrown if emojis were used at an earlier point of time.
The emoji style modifler is added explicitly in the data where needed by the emoji support library. Before, it was added using an incomplete "rule of thumb" in the drawable. The previous approach was incorrect, overly broad and won't work if the whole text replacement is handled by the library.