Axis and legend titles in medium contrast

and add margin between y axis title and labels

Change-Id: I0c3b8832d8fd479918129fef401f341dce27e776
diff --git a/R/ggplot-theme.R b/R/ggplot-theme.R
index aa68c42..a5f297c 100644
--- a/R/ggplot-theme.R
+++ b/R/ggplot-theme.R
@@ -45,9 +45,12 @@
                plot.title = element_text(hjust = 0.5),
                plot.subtitle = element_text(hjust = 0.5, size = 13, colour = mediumContrastColor),
                title = element_text(hjust = 0.5),
-               axis.title.x = element_text(hjust = 0.5, size=11),
-               axis.title.y = element_text(hjust = 0.5, size=11),
-               legend.title = element_text(size=11),
+               axis.title.x = element_text(hjust = 0.5, size = 11,
+                                           colour = mediumContrastColor),
+               axis.title.y = element_text(hjust = 0.5, size = 11,
+                                           margin = margin(r = 10),
+                                           colour = mediumContrastColor),
+               legend.title = element_text(size=11, colour = mediumContrastColor),
                panel.grid.major.x = element_line(linetype = "dotted", colour = lowContrastColor),
                panel.grid.major.y = element_line(colour = lowContrastColor),
                panel.grid.minor.y = element_blank(),