idgames_db_dump.ini: added UNIQUE to files.id and files.keysum
db_tool: shortened copyright blurb to fit on one line
idgames_db_dump: call time_value_difference() before delete()

- Added keysum to output of info message after adding idGamesFile to database
INIFile: fix formatting of file header comment
JSONParser: added call to generate_keysum() after parsing 'get'
XMLParser: added call to generate_keysum() after parsing 'get'
Roles/File: moved keysum into it's own role
Views/CLI/idGamesDbDump: fixed package name and POD
WADIndexer: fixed POD docs
idGamesDB: added another field to prepare/bind for keysum
idGamesFile: consume Keysum role, remove keysum method/attribute
Roles/Keysum: issue #118: added Keysum role
WADFile: issue #122: added object for parsed WAD files