limit DR value to 1..20
unique LV2-port symbols
add True-Peak + RMS variant -- DR14 GUI w/o DR14 :)
minimize exposure in TPnRMS meter
k-meter GUI code-details
gnoniometer UI: minimize phase-correlation meter exposure
EBUr clamp cairo_clip() to integers -> fixes moiree pattern in radar&hist
further rework of phase-correlation display exposure
update robtk (minimize drawing exposure)