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.

tools/generatePngIcons

@@ -45,7 +45,7 @@ colRef="#2a7fff"
 
 # Define theme names, and for each theme the color which will replace colorRef:
 declare -A themes
-themes=( ["dark"]="#BBBBBB" ["light"]="#252525" )
+themes=( ["dark"]="#CCCCCC" ["light"]="#252525" )
 
 # Optionally use pngquant to compress resulting PNGs:
 doCompress="false"