The implementation depends on creating different code paths from the now-legacy
behavior of text appending.
The annotation system introduced in this commit replaces the current way of
applying formats on text.
Up until now it has been quite a hassle for the user to control the formats, as
it required keeping track of the format positions with an opener and closer
formats almost every time (with the exception of own-closing formats).
The combination of Efl.Text API along with the Efl.Canvas.Text annotation API
essentially replaces the capabilities of the old format.
There is additional annotation API to allow more control, so be sure to check
the documentation/.eo files and the wiki page of Efl.Canvas.Text.
The style API now accepts actual strings of format style. There is not longer
need to instantiate as style with style_new() followed later by style_free().
@feature
Jean-Philippe Andre
Daniel Hirt
Tom Hacohen