Move menu system to saturnin's new 'menu' subcommad

saturnin v0.0.21+ adds new flexible menu handler so we don't need to
keep long pipes around in i3/config

dotfiles/i3/config

 bindsym $mod+Shift+Return   exec "xfce4-terminal"
 bindsym $mod+b              exec "saturnin www -1 | head -1 | uba -a"
 bindsym $mod+Shift+b        exec "saturnin www -1 | uba"
-bindsym $mod+i              exec "saturnin conf -j -S www.ini | saturnin dmenu -l 20 --split = | uba"
-bindsym $mod+Shift+i        exec "tac .local/share/uzbl/history | uniq | saturnin dmenu -l 20 --split-field 3 | uba"
+bindsym $mod+i              exec "saturnin menu www"
+bindsym $mod+Shift+i        exec "saturnin menu www_hist"
 bindsym $mod+c              exec "saturnin clip save"
 bindsym $mod+Shift+c        exec "saturnin clip load"
 bindsym $mod+Shift+f        exec thunar
 bindsym $mod+Escape         exec "saturnin iam afk"
 bindsym $mod+Shift+Escape   exec "saturnin iam gone"
 
-bindsym $mod+m              exec "saturnin conf -j -S -s dmenu.item | saturnin dmenu --split = | bash -"
+bindsym $mod+m              exec "saturnin menu status"
 bindsym $mod+Shift+m        exec "i3-dmenu-desktop --dmenu='saturnin dmenu'"
-bindsym $mod+p              exec "dmenu_path | saturnin dmenu | bash -"
-bindsym $mod+Shift+p        exec "tac .dmenu_history | awk '!seen[$0]++' | saturnin dmenu | tee -a .dmenu_history | bash -"
+bindsym $mod+p              exec "saturnin menu run"
+bindsym $mod+Shift+p        exec "saturnin menu run_hist"
 
 bindsym $mod+n              exec "saturnin kb next"
 bindsym $mod+Shift+n        exec "saturnin kb home"

dotfiles/saturnin/dmenu.ini

-[dmenu.item]
-    iam:AFK         = saturnin iam afk
-    iam:GONE        = saturnin iam gone
-    iam:BACK        = saturnin iam back
-    iam:UNDOCKING   = saturnin iam undocking
-    iam:ZLEEPING    = xfce4-terminal -T 'iam:ZLEEPING' -e 'saturnin iam zleeping'
-    kb:us           = setxkbmap us
-    kb:cz           = setxkbmap cz

dotfiles/saturnin/menu.ini

+[menu._default_]
+
+    name        = status
+    selector    = saturnin dmenu
+
+[menu.www]
+
+    generator   = saturnin conf -j -S www.ini
+    select_args = -l 20 --split =
+    consumer    = uba
+
+[menu.www_hist]
+
+    generator   = tac .local/share/uzbl/history | uniq
+    select_args = -l 20 --split-field 3
+    consumer    = uba
+
+[menu.status]
+
+    item        = iam:AFK         = saturnin iam afk
+    item        = iam:GONE        = saturnin iam gone
+    item        = iam:BACK        = saturnin iam back
+    item        = iam:UNDOCKING   = saturnin iam undocking
+    item        = iam:ZLEEPING    = xfce4-terminal -T 'iam:ZLEEPING' -e 'saturnin iam zleeping'
+    item        = kb:us           = setxkbmap us
+    item        = kb:cz           = setxkbmap cz
+    select_args = --split =
+    consumer    = bash -
+
+[menu.run]
+
+    generator   = dmenu_path
+    consumer    = bash -
+
+[menu.run_hist]
+
+    generator   = tac .saturnin-dmenu.log | awk '!seen[$0]++'
+    consumer    = tee -a .saturnin-dmenu.log | bash -