Added a few fixes to the command line - set executing command to false on error - throttle key events when scrolling through command history - Simplify the command stack
Added a few fixes to the command line
- set executing command to false on error
- throttle key events when scrolling through command history
- Simplify the command stack

shrimpy/kudu,shanselman/kudu,kenegozi/kudu,barnyp/kudu,kenegozi/kudu,kali786516/kudu,sitereactor/kudu,EricSten-MSFT/kudu,kali786516/kudu,oliver-feng/kudu,WeAreMammoth/kudu-obsolete,duncansmart/kudu,dev-enthusiast/kudu,mauricionr/kudu,chrisrpatterson/kudu,puneet-gupta/kudu,kenegozi/kudu,uQr/kudu,badescuga/kudu,kali786516/kudu,shrimpy/kudu,uQr/kudu,sitereactor/kudu,juoni/kudu,YOTOV-LIMITED/kudu,sitereactor/kudu,puneet-gupta/kudu,YOTOV-LIMITED/kudu,shibayan/kudu,duncansmart/kudu,chrisrpatterson/kudu,badescuga/kudu,juoni/kudu,juvchan/kudu,sitereactor/kudu,MavenRain/kudu,badescuga/kudu,sitereactor/kudu,dev-enthusiast/kudu,juoni/kudu,juvchan/kudu,shibayan/kudu,WeAreMammoth/kudu-obsolete,WeAreMammoth/kudu-obsolete,mauricionr/kudu,kenegozi/kudu,oliver-feng/kudu,shanselman/kudu,juvchan/kudu,kali786516/kudu,duncansmart/kudu,badescuga/kudu,dev-enthusiast/kudu,projectkudu/kudu,oliver-feng/kudu,uQr/kudu,bbauya/kudu,MavenRain/kudu,bbauya/kudu,EricSten-MSFT/kudu,projectkudu/kudu,EricSten-MSFT/kudu,MavenRain/kudu,puneet-gupta/kudu,EricSten-MSFT/kudu,shibayan/kudu,mauricionr/kudu,mauricionr/kudu,bbauya/kudu,YOTOV-LIMITED/kudu,juvchan/kudu,juoni/kudu,badescuga/kudu,chrisrpatterson/kudu,projectkudu/kudu,EricSten-MSFT/kudu,shrimpy/kudu,shibayan/kudu,puneet-gupta/kudu,shrimpy/kudu,duncansmart/kudu,puneet-gupta/kudu,shibayan/kudu,barnyp/kudu,bbauya/kudu,projectkudu/kudu,YOTOV-LIMITED/kudu,uQr/kudu,barnyp/kudu,dev-enthusiast/kudu,oliver-feng/kudu,MavenRain/kudu,chrisrpatterson/kudu,projectkudu/kudu,shanselman/kudu,barnyp/kudu,juvchan/kudu