SharedControl class is now synchronized shared class.

Fixed working of SharedControl.invoke/delayInvoke methods when a given-function has multiple arguments.

Removed many deprecated elements.

Removed commented out old style EventHandlers.

printing module is now not experimental.

PageSetupDialog now preserves previously set page settings.
PrintPreviewDialog now resets window state before closing the window.

Show last page on PrintPreviewDialog

The PrintPreviewDialog draws now the page to fill the entire window.

std.printing supports now different paper orientations for each page

Update README and brushed up examples

dfl.printing and dfl.drawing is updated

- In dfl.printing, default printing scale is now GraphicsUnit.DISPLAY (BREAKING CHANGE)
- In drawing, multiple monitor is now suport
- Changed common dialog example code about printing