theme: rename files for better coherency

Our `theme.lua` is now really a theme and its previous content is
moved in `apparance.lua`. Moreover, we play a bit with window borders.

rc/apparance.lua

@@ -0,0 +1,34 @@
+-- Theme
+beautiful.init(awful.util.getdir("config") .. "/rc/theme.lua")
+
+-- GTK stuff: we choose Adwaita theme which seems to be the only one
+-- kept up-to-date with GTK2 and GTK3...
+
+-- Also see: http://developer.gnome.org/gtk3/3.2/GtkSettings.html
+local gtk = 'gtk-font-name="' .. beautiful.font .. '"' .. [[
+
+gtk-theme-name="Adwaita"
+gtk-icon-theme-name="gnome-wine"
+gtk-cursor-theme-name="oxy-cherry"
+gtk-cursor-theme-size=0
+gtk-toolbar-style=GTK_TOOLBAR_BOTH
+gtk-toolbar-icon-size=GTK_ICON_SIZE_LARGE_TOOLBAR
+gtk-button-images=1
+gtk-menu-images=1
+gtk-xft-antialias=1
+gtk-xft-hinting=1
+gtk-xft-hintstyle="hintfull"
+gtk-xft-rgba="rgb"
+gtk-key-theme-name="Emacs"
+]]
+
+local gtk2 = io.open(os.getenv("HOME") .. "/.gtkrc-2.0", "w")
+gtk2:write(gtk)
+gtk2:close()
+
+-- GTK3 is the same, but no double quotes for strings
+local gtk3 = io.open(os.getenv("HOME") .. "/.config/gtk-3.0/settings.ini", "w")
+gtk, _ = gtk:gsub('"', '')
+gtk3:write("[Settings]\n")
+gtk3:write(gtk)
+gtk3:close()