Added Prefix for codecanyon rejections

[MehbubRashid]

The functions or methods outside any class should be prefixed with the unique plugin name.Otherwise codecanyon soft rejects it.

[smileBeda]

In WordPress too.
While WPPB did in fact use unique function names such as activate_plugin_name, indeed WP Coding Standards actually ask you to prefix, not to suffix function names.

Thus, this has been observed in the new fork.

Thanks @MehbubRashid.