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Evas font: allow ":fallbacks" keyword when Evas parses font keyword

Authored by id213sin on Feb 17 2016, 1:23 AM.

Description

Evas font: allow ":fallbacks" keyword when Evas parses font keyword

Summary:
Developers could use fallback fonts using only font_fallbacks keyword.
The keyword is only allowed for Evas Textblock. It has to be common
feature for other text type objects.
Applying this patch, Text and Textgrid can add fallback fonts.
@feature

Test Plan:
Set font like the following example to Textblock, Text, Textgrid.
Sans:fallbacks=Inconsolata

Reviewers: tasn, herdsman, woohyun

Subscribers: cedric, jpeg

Differential Revision: https://phab.enlightenment.org/D3704