Huge update, remove my timeout, consts_enums, etc

* Bumped version to 0.6.0 to signify big update
* Removed my timeout mechanism as libvncclient's already is fine and mine was causing minor issues
* Fixed Windows crash, caused by use-after-free which didn't show up on other platforms
* Removed wonky app/itm options and F8 controls-referencing, using file-level structs and not the dumb consts_enums defines
* Fixed child windows bug where closing with window-manager close button didn't fire necessary handling logic, preventing child windows to open afterward
* Commented out inactive timeout stuff but leaving for possible implementation in the future
* Replaced old C-style num-to-string code with `std::to_string()`
* Reformatted and updated help screen text
* Successfully building on all but OpenIndiana.  It's possible my OpenIndiana VM isn't updated correctly or is corrupt

Author: willbprog127