Edit Doxyfile to change colour scheme and use CSS

Also moved custom CSS to /cmake_templates

Author: tomchadwin

cmake_templates/Doxyfile.in

@@ -838,6 +838,12 @@ HTML_FOOTER            =
 
 HTML_STYLESHEET        =
 
+# @tomchadwin addition - NEEDS Doxygen version bump to work.
+# Assumes Doxygen is run from this directory (/cmake_templates) - if not,
+# must specify correct path
+
+HTML_EXTRA_STYLESHEET  = api_custom.css
+
 # The HTML_COLORSTYLE_HUE tag controls the color of the HTML output.
 # Doxygen will adjust the colors in the stylesheet and background images
 # according to this color. Hue is specified as an angle on a colorwheel,
@@ -846,7 +852,7 @@ HTML_STYLESHEET        =
 # 180 is cyan, 240 is blue, 300 purple, and 360 is red again.
 # The allowed range is 0 to 359.
 
-HTML_COLORSTYLE_HUE    = 220
+HTML_COLORSTYLE_HUE    = 113
 
 # The HTML_COLORSTYLE_SAT tag controls the purity (or saturation) of
 # the colors in the HTML output. For a value of 0 the output will use