GPII-134, GPII-124: Contrast theme for Discovery Tool more or less properly implemented. The text labels need to be placed in their own containers and top-aligned to the check icon. Fixed the text label colour to be more visible in default theme.
Merge remote-tracking branch 'upstream/master' into GPII-134
GPII-134: Put icon text labels into their own container and aligned them closer to the icon itself.
FLUID-4947: removed a string length constraint.
FLUID-4947: added more improvements to announcements.
Merge remote-tracking branch 'upstream/master' into GPII-134

Conflicts:
	src/discoveryTool/css/DiscoveryTool.css
GPII-134: Merged changes from Master. Fixed positioning of checkbox in high contrast to be similar to the default view. Panel Bar now appears white on black.
Merge remote-tracking branch 'yura/FLUID-4947'

* yura/FLUID-4947:
  FLUID-4947: added more improvements to announcements.
  FLUID-4947: removed a string length constraint.
GPII-134: removed uneeded comment.
Merge remote-tracking branch 'jon/GPII-134'

* jon/GPII-134:
  GPII-134: removed uneeded comment.
  GPII-134: Merged changes from Master. Fixed positioning of checkbox in high contrast to be similar to the default view. Panel Bar now appears white on black.
  GPII-134: Put icon text labels into their own container and aligned them closer to the icon itself.
  GPII-134, GPII-124: Contrast theme for Discovery Tool more or less properly implemented. The text labels need to be placed in their own containers and top-aligned to the check icon. Fixed the text label colour to be more visible in default theme.