Tidy up HC icons.

Remove and fix stray Hicontrast (HC) icons.
- Remove old HC icons from Human, Oxygen & Tango themes. (They should only exist in specific HC theme).
- Move few icons misplaced in Galaxy to correct HC theme.
- Fix HC filename: lch_autopilotmenu > lc_autopilotmenu.

Change-Id: I12b9729888ff7927f9c8f31d1d66d178ef39150b
Signed-off-by: Andrew <dent.ace@gmail.com>
Reviewed-on: https://gerrit.libreoffice.org/14352Reviewed-by: Jan Holesovsky <kendy@collabora.com>
Tested-by: Jan Holesovsky <kendy@collabora.com>

icon-themes/oxygen/CopyrightsHuman

@@ -20,7 +20,6 @@ Copyright 2004-2006 by Canonical Ltd. Available under the terms of the Creative
 /cmd/lc_outlinedown.png
 /cmd/sc_outlinedown.png
 /cmd/sc_savebasicas.png
-/cmd/lch_helpindex.png
 /cmd/lc_recsearch.png
 /res/fileopen.png
 /res/foldercl.png