Remove handswitch button and update grab buttons
requested to merge 21-defining-chraacter-s-behavior-regarding-the-control-align-grabbuttons into 21-defining-character-s-behavior-regarding-the-control
Related #21
To prevent confusion, I removed hand-switch button and related variables and logics. @chan.yong.lee please check once and if it is ok, merge it into your 21-branch.