Update -- Reorganise Keybindings

Update -- Reorganise Keybindings

This changeset is a major reorganisation of my keybindings.  It moves
all of the keybind defs, barring a few exceptions, into 90-keys.el.

Removed: F5, F6, F7, F8, F9, XF86Cut, XF86Copy, XF86Paste, C-!
Changed: #'lisp-complete-symbol from S-TAB to H-TAB
    New: C-xp -> #'what-page
         C-F2 -> #'redo
         M-insert -> #'copy-primary-selection
         C-insert -> #'kill-primary-selection
         XF86Search -> #'ddg-search
	 C-XF86Search -> #'ddg-search-region
	 XF86Messenger -> #'LXQt-riece
	 XF86Calendar -> #'calendar
	 XF86Mail -> #'gnus-other-frame
	 C-cu -> #'sy-insert-unicode

	* 90-keys.el: Attempt to organise everything a little better with
	most of the bindings from the other init files moved here.

	* 16-riece.el: Move keybindings to 90-keys.el

	* 12-misc.el: Move keybindings to 90-keys.el
	(ddg-search): New.  Search DuckDuckGo
	(ddg-search-region): New. Search DuckDuckGo on region.

	* 11-cal.el: Move keybindings to 90-keys.el

	* 10-pkgs.el: Move keybindings to 90-keys.el

	* 05-latex.el: Move keybindings to 90-keys.el

	* init-el: 02-keys -> 90-keys

Signed-off-by: Steve Youngs <steve@sxemacs.org>