Bulk graphics operations, merging undo

Because several students asked how to combine multiple graphics operations into one undo, a more practical combineregen function was added.

• IOS Application Example (Giviewhelper *hlp)

  [HLP combineregen:^{    Hlp.command = @ "line{' points ': [10,10, 20,20, 20,10, 30,20]}";    Hlp.command = @ "lines{' points ': [10, 10, 20, 20, 20, 10, 30,20]}";}];

• Android Application Example (Iviewhelper hlp)

  Hlp.combineregen (New Runnable () {    @Override public    void Run () {        Hlp.setcommand ("line{' points ': [10, 10, 20,20, 20,10, 30,20]} ");        Hlp.setcommand ("lines{' points ': [10,10, 20,20, 20,10, 30,20]}");}    );

• C # application Example (Wpfviewhelper hlp)

  Hlp.combineregen (Delegate () {    Hlp.command = "line{' points ': [10,10, 20,20, 20,10, 30,20]}";    Hlp.command = "lines{' points ': [10, 10, 20, 20, 20, 10, 30,20]}";});

Bulk graphics operations, merging undo