Update frontier URL and fix news handling.

[rankynbass]

When commit 050c3c4 was added to XL, it broke XL.Core.

1. The frontier URL endpoint was changed, and the XL.Common launcher now requires a frontier URL. I made a quick and dirty hack to hardcode the lastest value of "https://launcher.finalfantasyxiv.com/v650/index.html?rc_lang={0}&time={1}". Considering the current default value of "https://launcher.finalfantasyxiv.com/v620/index.html?rc_lang={0}&time={1}" still works most of the time, this should work until 7.0.
2. Headline handling was changed from a single function to four. I adjusted the NewsFrame class to account for these changes.