wish for new features in editor

[superkalt]

fix and unfix aspect ratio of shapes and images
reset of ratio
scaling of shapes and images in % (by typing the %number)
turn of shapes and images in 45° and 90° degree (or by typing) perhabs a "green dot" or line if the angle is 0,90,180,270 or "red" if not
mirror vertical and horizontal => will work with scaling from 100 to -100
add connection points to shapes and images