Instead of adding only the skin tone variations to emojis_skintone_modifiable.txt and explicitly adding the base variation in Emoji.init(), we can just add the base variant in gen_emojis.txt and can remove special handling in Emoji.java, including the copy constructor that we needed for this specific case

Partly revert be0aa07.

The width of the navigation was not accounted correctly.

This reverts be8a99bd

The cursor might move in the middle of a surrogate pair.

Suggest an emoji in addition to the 3 suggested words when the
current word matches an alias in the emoji dictionary, if
available.

The font size of the suggested words is reduced if the word would
otherwise split on two lines.