Initial i3 configuration

This is derived from my Awesome configuration. Still a lot to do from
a WM perspective. The organization is a bit different and I am giving
it up on the per-display systemd units as it does not really work due
to the fact we only have one user DBus and one environment.

dotfiles/xkb/default.xkb

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+# -*- conf -*-
+
+# Default configuration with:
+#  - compose → rwin, ralt or menu
+#  - capslock as ctrl
+#  - pause key becomes xscreensaver
+xkb_keymap {
+        xkb_keycodes  { include "evdev+aliases(qwerty)" };
+        xkb_types     { include "complete" };
+        xkb_compat    { include "complete" };
+        xkb_symbols   { include "pc+us+inet(evdev)"
+                        include "compose(rwin)+compose(menu)+compose(ralt)"
+                        include "ctrl(nocaps)"
+                        include "vbe(pause)" };
+        xkb_geometry  { include "pc(pc105)" };
+};

dotfiles/xkb/symbols/vbe

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+partial
+xkb_symbols "pause" {
+    key <PAUS> {
+        [ XF86ScreenSaver, XF86ScreenSaver ]
+    };
+};
+
+partial modifier_keys alphanumeric_keys
+xkb_symbols "x1gen2" {
+    key <LCTL> { [ Escape, Escape ] };
+    key <HOME> { [ Control_L, Control_L ] };
+    key <END>  { [ Control_L, Control_L ] };
+    modifier_map Control { Control_L, <HOME>, <END> };
+
+    key <TLDE> { [ Insert, Insert ] };
+    key <ESC>  { [ grave, asciitilde, dead_grave, dead_tilde ] };
+};

dotfiles/xkb/thinkpad-extra.xkb

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+# -*- conf -*-
+
+# Configuration for thinkpad extra buttons
+xkb_keymap {
+        xkb_keycodes  { include "evdev+aliases(qwerty)" };
+        xkb_types     { include "complete" };
+        xkb_compat    { include "complete" };
+        xkb_symbols   { include "pc+us+inet(evdev)" };
+        xkb_geometry  { include "pc(pc105)" };
+};

dotfiles/xkb/x1gen2.xkb

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+# -*- conf -*-
+
+# Configuration for a Lenovo X1 Carbon Gen 2 keyboard
+#
+# This keyboard is a mess. Really. Here is what we do about it:
+#
+#  - transform Home and End as a Control_L key
+#  - transform Backquote (between left alt and left ctrl) into Insert
+#  - transform Escape to Backquote. Let's say we don't need escape.
+#
+# Escape can be replaced with C-[. See:
+#  http://vim.wikia.com/wiki/Avoid_the_escape_key
+xkb_keymap {
+        xkb_keycodes  { include "evdev+aliases(qwerty)" };
+        xkb_types     { include "complete" };
+        xkb_compat    { include "complete" };
+        xkb_symbols   { include "pc+us+inet(evdev)"
+                        include "compose(ralt)+ctrl(nocaps)"
+                        include "vbe(x1gen2)" };
+        xkb_geometry  { include "pc(pc105)" };
+};