release 4
* fixed uninitialized pointer to log window instance causing a crash
* replaced AspeCl with FJCs RCL (#54)
* added enable/disable checkbox for URL submit (#52) (TheMontezuma)
* simplified serial port selection (#51) (TheMontezuma)
* code cleanup, UI code reorganization, misc bugs (#48) (blind)
* code cleanup (#47) (josch1710)
* Fix crash from double call to closeEvent (#46) (josch1710)
* CPU load reduction for software handshake (#45) (TheMontezuma)
* added URL submit functionality (#43) (TheMontezuma)
* further PCLINK work (#37, #38, #41, #42, #44) (TheMontezuma and josch1710)
* add PCLINK swap + PCLINK eject + code refactoring (#31) (TheMontezuma)
* printer emulation status now persists (#30) (TheMontezuma)
* added PCLINK support (#29) (TheMontezuma)
* trigger options menu on speedlabel click (#28) (TheMontezuma)
* added timing adjustment to close #2
* diskeditdialog now closes on program exit
* upgraded SpartaDOS boot files to 3.2G