vim: Load other always-on plugins too

And move the plugin specific keybindings into 40-keybindings.vim.
`packloadall` sources the plugins directly in contrast to `packadd`.
Because of that we can access the `g:loaded_*` variables and do not have
to specify our own keybindings for vim-surround as now the user bindings
are loaded later and overwrite possible clashes.

.config/vim/vimrc.d/40-keybindings.vim

@@ -83,3 +83,11 @@ if (has('nvim'))
 elseif (has('terminal'))
 	nmap <leader><CR> :terminal<CR>
 endif
+
+" Plugin specific bindings
+if (get(g:, 'loaded_fzf'))
+	nmap <leader>f :Files<CR>
+	if (get(g:, 'loaded_gutentags'))
+		nmap <leader>t :Tags<CR>
+	endif
+endif