Added Latest MC Version Setting
Many Changes

-Added variables for Pack INI's
-Check PackINI's and decide whether to redownload.
-Added downloading of ModpackZIP if DownloadMods = True
-If there is no pack INI or if it failed to download, write a blank one.
otherwise read it.
Added ModpackIniRead and ModpackIniWrite

INI writing and reading for individual packs.
Pretey much identical to the ones for settings.ini