evas textblocke: add align=end for putting a text at the opposite side of LTR/RTL

evas textblocke: add align=end for putting a text at the opposite side of LTR/RTL

Summary:
There is a requirement for putting text at right side for LTR and at left side for RTL.
It satisfies that reqirement easily.

It also add "start" keywork for "align" tag. "start" will be same with "auto".
Intuitionally, developer will try "align=start" if they once saw "align=end" in elsewhere.
On the other hand, it only add "END" as new enumeration value for efl interface.
@feature

Test Plan: N/A

Reviewers: herdsman, cedric, jpeg, raster

Reviewed By: raster

Subscribers: woohyun

Differential Revision: https://phab.enlightenment.org/D5342