Delphi treacker: border-line and vertical orientation behavior, double Buffering to elimate flicker when the control repaints, improved mouse interaction, it now continues to update the position

DELPHI VCL 控件，运行时可以拖动和改变大小，用于对一些区域标注，并且可以改变边框的颜色-DELPHI VCL control, run-time can drag and change the size, for some regional labeling, and can change the border color