[Icons] Adjust look of settings/refresh icons

Adjust appearance of settings icon, refresh icon,
and switcher view to match more closely with
provided mock-ups and other specifications.
Specifically, add drop shadow to refresh and
settings and tweak alignment of these buttons
around the view switcher.
[Icons] Remove more outdated icons
[Icons] Test ContextAwareButton's icon usage
[Icons] Remove menu icon from Refresh

Remove the SMALL_ICON key from RefreshAction;
this is used for menu items, but icon is only
desired for buttons (which use LARGE_ICON_KEY)
[Icons] Clean up commented-out code
Merge pull request #178 from VWoeltjen/mct138

[Icons] Tweak appearance to match mock-ups