Create new spell book + Import XML to Database

Create button loads dialog box for spell book name input. Create button
event handler loads dialog box for book name input, adds name to
spellbooks table, adds name to spellbooks List and updates combobox, and
creates the new table and loads it.

Import button shows file open dialog for user to select an xml file. XML
data is loaded into a DataSet then added to the database. If no database
is loaded then import button does nothing.
Long overdue commit. Added delete spellbook feature

Lots of reorganization. Some robustness features. Delete spellbook
feature. Who knows what else. I suck at github.
Removed Load button

Removed load button... Had to adjust Create, Delete,
loadSelectedDatabase methods as a result.
Cleanup

No big changes, just some cleanup.
- fixed delete spell book message box to show correct message
- added text to main form
- Made global SQLiteCommand instance
- removed all "this." for consistency's sake
- combined fillDatabase and addRowsToDatabase since they always go
together
- removed group box enabling and disabling code which is no longer used
Revert "Cleanup"

This reverts commit a043a30b289e88c7ea6c4590b308a7ae7bf75867.
Cleanup... Attempt 2

Ignore previous two commits... I screwed up.

No big changes, just some cleanup.
- fixed delete spell book message box to show correct message
- added text to main form
- made global SQLiteCommand instance
- removed all "this." for consistency's sake
- combined fillDatabase and addRowsToDatabase since they always go
together
- removed group box enabling and disabling code which is no longer used
Removed Close and Import buttons

Apparently I deleted more stuff? This commit should have happened a
month ago when I actually made these changes....
- Removed Close button because it was pointless. RIP.
- Removed Import button because that functionality will be handled by
the Add/Edit Spells button which will open the XML Writer. XML Writer
will need to be modified to write to the database. Previously the import
button called addRowsToTable(..), which writes to the SQLite database.
This method still exists but is not currently being called by anything.
- loadSelectedDatabase() removed because it is now linked directly to
the CoBx selected index changing, so that functionality exists in that
event listener now