Changes to PackPicker ComboBox

Changes needed to allow popualtion by list
Gets names of modpacks then populates combobox

-New variables
-Now adding http:// to all WebRequests because I am splitting with a
colon and http:// has a colon...
-i = 1
-Allways have vanilla option
-Gets name off modpack textfiles and adds to list
-Populates Combobox with list.