Update Nyquist plug-in headers

Mostly consistency updates, plus a couple of minor fixes.
Line breaks in translated control text strings do not work, so have
been removed.
Obsolete ";categories" commands removed, and ";info" commands replaced
with standard Lisp comments.

plug-ins/tremolo.ny

@@ -1,27 +1,27 @@
-;nyquist plug-in
-;version 3
-;type process
-;preview linear
-;categories "http://lv2plug.in/ns/lv2core#ModulatorPlugin"
-$name (_"Tremolo")
-;manpage "Tremolo"
-;debugbutton disabled
-$action (_"Applying Tremolo...")
-$author (_"Steve Daulton")
-$copyright (_"Released under terms of the GNU General Public License version 2")
+$nyquist plug-in
+$version 3
+$type process
+$preview linear
+$name (_ "Tremolo")
+$manpage "Tremolo"
+$debugbutton disabled
+$action (_ "Applying Tremolo...")
+$author (_ "Steve Daulton")
+$copyright (_ "Released under terms of the GNU General Public License version 2")
 
 ;; tremolo.ny by Steve Daulton (www.easyspacepro.com) July 2012.
 ;; Based on Tremolo by Dominic Mazzoni and David R. Sky."
+
 ;; Released under terms of the GNU General Public License version 2:
 ;; http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 ;;
 ;; For information about writing and modifying Nyquist plug-ins:
 ;; https://wiki.audacityteam.org/wiki/Nyquist_Plug-ins_Reference
 
-$control wave (_"Waveform type") choice ((_"sine") (_"triangle") (_"sawtooth") (_"inverse sawtooth") (_"square")) 0
-$control phase (_"Starting phase (degrees)") int "" 0 -180 180
-$control wet (_"Wet level (percent)") int "" 40 1 100
-$control lfo (_"Frequency (Hz)") float-text "" 4 0.001 1000
+$control wave (_ "Waveform type") choice ((_ "sine") (_ "triangle") (_ "sawtooth") (_ "inverse sawtooth") (_ "square")) 0
+$control phase (_ "Starting phase (degrees)") int "" 0 -180 180
+$control wet (_ "Wet level (percent)") int "" 40 1 100
+$control lfo (_ "Frequency (Hz)") float-text "" 4 0.001 1000
 
 ; Convert % to linear
 (setq wet (/ wet 200.0))