input: Add to support multi-line Input.

[huacnlee]

• Render multi-line text and wrap lines if too long.
• Enter to create newline and move cursor to start of next line (To be test).
• Paste to support \n to keep newlines.
• Paint correct position of cursor and selection.
• Click mouse to position the cursor at the mouse position.
• Fix cut range out of panic (The selection range is UTF-16).
• Empty line to support click to position cursor.
• Support display multiple lines selection.
• Home, End or Shift-Home, Shift-End to move/select to line start, end, not the text start, end.
• Up, Down or Shift-Up, Shift-Down to move/select cursor to previous, next line.
• Do not show clear icon, if in multi-line mode.
• Command-Backspace, Command-Delete to deletes to beginning/end of line.
• Keep selected word range when drag move at same mouse down time.
• Correct click position when scrolled.
• Add Ctrl-Shift-A and Ctrl-Shift-E to select to home/end on macOS.

TBD

• input: Option+Left/Right to move word #466
• input: Improve mask "*", if use mask to vertical center #467
• input: Up, Down to keep the same column if it possible #468
• input: Undo to keep selection or cursor position #469
• input: Show scrollbar for multi-line mode. #470

[huacnlee]

Next

The first line end of white space will get cursor position.
The second line wrapped have incorrect cursor position.

[huacnlee]

[huacnlee]

[huacnlee]