added hex editor example

added drawing mode feature to draw lines on plot example

added slider with step size example

added custom menu bar item with checkboxes example

added coloured tree nodes example and a custom colours for bar series example

updated examples for how to drag an undecorated viewport

removed callback and default_value

added example of a background gradient applied to a window

a complete packaging example showing how a DPG app can be made into a standalone executable on mac/windows

radio buttons in menubar by v-ein

added logging examples folder

added node editor example by v-ein

added camera capture example, plot with button, and a status bar at the bottom of viewport

main : drawing a line series on a plot

main : updating a time graph from the render loop