Remove default values for clientName/Location
UI improvements to Main layout

* The main screen now has two click spots
    * First half is for the card
    * Second half is for managing tags
* ReadingFragment no longer exists
* CardFragment now represents the card itself
Move options menu from CardFragment to MainActivity

CardFragment no longer needs its own options menu.
Remove ListContentFragment

Unused class. What is it supposed to be used for? o_O
Launch the tags list as a fragment

* Remove CardFragment and move all code to MainFragment
    * Nested Fragments have undefined behavior in general
* Move Main layout code to MainFragment
* Manage tag list and main layout stuff as individual fragments
* Reestablish the LoginFragment
Enable home icon in TagsList to go up to MainFragment
Card-editing has a new interface

Replace the original preferences-based interface for editing the card
with a more natural one.
Add abstract Activity for NFC reading + writing

And change MainActivity to inherit from this.
Change title of the edit card dialog

Copy-pasted it and forgot to change it the last time around.
Update NfcSkeleton library
Folded NFC writing code into MainActivity

WriteTagActivity is now mostly useless. NFC writing is now prompted with
a dialog box.
Manage fragment tags from Utils

Some tags were being reused and could potentially interfere with other
fragment transactions.
Remove unnecessary fragment transactions in SendProgress

This fragment currently starts an activity. It's not needed right now.
Handle tag information fetching cancellation gracefully

When the user "cancels" the progress dialog that appears after reading a
tag, gracefully kill the task and quit the dialog without issue.
Project cleanup

Use IntelliJ's code inspections to guide refactoring.
Change Add Tag to flow to write NFC after submit

Also, remove WriteTagActivity because it's useless.
Update dialog titles

Titles were copy-pasted and were irrelevant to their respective dialog
boxes.
Update comments
Use SDK level 16 <- 17