Hard Candy, Uncommon, and Proporta have all announced their new case lineups for the iPhone 4. Hard Candy’s new cases include both soft touch and metallic versions of its textured polycarbonate Bubble Slider case, the snap-on Superlight case, and the soft touch, polycarbonate Candy Slider, all of which are priced at $35. Uncommon will be offering customizable versions of its TPU-based Trooper Case and Gallery Case—in white or black—as…