eolian_mono: add more verbs to generate C# method beginning with verb

eolian_mono: add more verbs to generate C# method beginning with verb

Summary:
C# language binding generates C# method name beginning with verb by
checking verb list in name_helpers.hh.

Some verbs used in eo method are missing in the current verb list. So
they are added into the verb list.

In this scheme, there is a problem that some words can be used as a verb
in some methods but they also can be used as a noun in other methods.
(e.g. drag_start as a verb / cursor_word_start as a noun)

So "start" and "scroll" are not added to verb list in this patch.
To resolve the above problem, we may need a new eo syntax to rename or
reverse the name in language bindings.

Test Plan: Check C# method names in .eo.cs files if the name begins with verb.

Reviewers: felipealmeida, SanghyeonLee, woohyun, Jaehyun_Cho, segfaultxavi

Reviewed By: segfaultxavi

Subscribers: cedric, #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D10001