Icons tweaked #4469

- The "light" icon theme is now a little lighter, to increase contrast.
- Toolbox icons are now small.
- Buttons:
  - Buttons without labels which use icons as their only source of info regarding what the button does (e.g. the white-balance pipette button) use normal-sized icons.
  - Labeled buttons which use icons as an auxiliary source of information (e.g. Auto-Crop) now use small icons. Curve type icons are also small even though they have no labels.
- Colored circles are smaller.
- Curve type icons redesigned and small.
- Hand icons (when panning the preview) redesigned to have a clear outline regardless of background color.
- Magnifier icons redesigned to have a thinner magnifier frame and larger inner parts.
- Perspective, distortion and crop icons redesigned.
- Some small icons were missing the `-small` suffix, now renamed.

rtgui/distortion.cc

@@ -28,15 +28,15 @@ Distortion::Distortion (): FoldableToolPanel(this, "distortion", M("TP_DISTORTIO
 
     rlistener = nullptr;
     autoDistor = Gtk::manage (new Gtk::Button (M("GENERAL_AUTO")));
-    autoDistor->set_image (*Gtk::manage (new RTImage ("distortion-auto.png")));
+    autoDistor->set_image (*Gtk::manage (new RTImage ("distortion-auto-small.png")));
     autoDistor->set_alignment(0.5f, 0.5f);
     autoDistor->set_tooltip_text (M("TP_DISTORTION_AUTO_TIP"));
     idConn = autoDistor->signal_pressed().connect( sigc::mem_fun(*this, &Distortion::idPressed) );
     autoDistor->show();
     pack_start (*autoDistor);
 
-    Gtk::Image* idistL =   Gtk::manage (new RTImage ("distortion-pincushion.png"));
-    Gtk::Image* idistR =   Gtk::manage (new RTImage ("distortion-barrel.png"));
+    Gtk::Image* idistL =   Gtk::manage (new RTImage ("distortion-pincushion-small.png"));
+    Gtk::Image* idistR =   Gtk::manage (new RTImage ("distortion-barrel-small.png"));
 
     distor = Gtk::manage (new Adjuster (M("TP_DISTORTION_AMOUNT"), -0.5, 0.5, 0.001, 0, idistL, idistR));
     distor->setAdjusterListener (this);