Don’t let the date on the calendar or those still chilly early mornings fool you. As far as the film studios are concerned, the summer movie season has already started. It’s a time when the days (and running times) are generally longer, a more than normal amount of stuff blows up and your hearing might come under assault. Here’s a select list of some promising looking mainstream offerings and a few of the under-the-radar art-house titles coming out in the next few months. Please note: all release dates are subject to change. April 22 ‘The Unbearable Weight of Massive Talent’ In what could be the textbook example of Meta self-awareness, Nicolas Cage stars as Nick Cage, an actor going through a professional dry spell who is offered $1 million to attend the birthday party of one of his biggest fans. Chaos and hilarity soon follow. ‘The Northman’ The third effort …