Macworld TL;DR: Get an iScanner lifetime subscription on sale for $40 (reg. $199). Desktop scanners are bulky, location-bound, and slow to set up when you only need a quick scan. iScanner is an iOS scanner app that puts all the functions of a desktop scanner into your phone, and that’s just the start of what it can do. A lifetime subscription is also now on sale for $39.99 (reg. $199). Open the app, frame the page, and shoot. iScanner auto-detects edges, fixes perspective, and cleans shadows. Save or export as PDF, JPG, DOC, XLS, or TXT, then share wherever you work. It’s handy for signed form…