store each note's state as key-value pairs

[maoschanz]

like

title=the note title
x=500
y=500
width=200
height=120
color=255,20,130
hidden=false
font-size=12

instead of parsing a single line to split it according to ; symbols

(drawback: maybe think about retro-compatibility of that code!)

[maoschanz]

(maybe think about retro-compatibility of that code)

version 21 should be used as a transition (the "title" line will be empty)