Stable Packing List w/XML and Updated Inferfaces

"Moving Current Stable Packing List Into Packing List Branch on Group O Repo"

-Redesigned Packing List UI (See: activity_packing_list.xml)

-Made Page for Handling Packing List Edits (See: PackingListEdit.java, activity_packing_edit.xml)

-Edited androidmanifest.xml to have new PackingListEdit Activity

-Provided Working Page Navigation thru button presses, See .java files.