[Tizen][Runtime] Add "allow-navigation" handler for Tizen legacy WGT
package.

This element defines a list of URL domains that are allowed to be navigated in the Web
Application window for Tizen legacy WGT.

Please refer to
https://source.tizen.org/sites/default/files/page/tizen-2.2-wrt-core-spec.pdf
for more details.
Merge pull request #1729 from takethathe/allow_navigation

[Tizen][Runtime] Add "allow-navigation" handler for Tizen legacy WGT package.