[Tizen] Verification name of a widget entry file

This patch contains function which verify name
of the widget entry file during installation.
Table contains list of proper names of the files
has been moved to constans.

BUG=XWALK-2983
From [the style guide](https://google-styleguide.googlecode.com/svn/trunk/cppguide.html#Variable_Names): _The names of variables and data members are all lowercase, with underscores between words_, so `entry_pages` instead of `entryPages`.

Additionally, I think it makes sense to make it `static` to avoid creating the vector on every invocation.