As they turn 50 this year, Japanese developers and publishers Konami have announced three collections bagging up a number of former glories: Contra side-scrolling shooters, a big of old arcade games, and the metroidvania series Castlevania. Konami haven't yet revealed the full contents of the Contra and Castlevania collections, but so far they're very much leaning towards the early days. Hey, when I turn fifty,…