v0.13.0

• made vt.feed_str return proper Changes struct (with changed line numbers, resize indicator, scrollback drainer iterator)
• made parser return operation instead of calling the Executor trait directly
• used proper enums for control functions and their args
• made distinction between DECSC/DECRC and SCOSC/SCORC functions
• added support for SGR 29 (reset strike-through)
• added support for colorspace parameter in CSI 38/48 (thanks @GoldsteinE!)
• renamed CursorKeyMode -> CursorKeysMode
• removed ScrollbackCollector, added TextUnwrapper, refactored TextCollector