Initial commit: Schunix as it stands before the SchOS rename

An x86-64 operating system built from xv6, now largely rewritten: SMP,
a copy-on-write root filesystem (SchFS), PCI/USB/virtio drivers, a TTF
rasteriser, and a Linux-numbered syscall ABI.

No history before this point -- the tree was never under version control.
This commit exists so the rename that follows has something to undo to.

projects/schde/README.md

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+# SchDE — the Schunix Desktop Environment
+
+The parts you actually look at: a panel, a launcher, settings, a file
+manager, a terminal.
+
+SchDE is a set of ordinary Schcom clients plus whatever shared widget code
+they end up needing. Nothing in it is privileged and nothing in it is
+special — if SchDE can do something that a third-party program could not, the
+line has been drawn in the wrong place.
+
+## Status
+
+Not started. Last of the three, and deliberately so: there is no point
+designing a panel before there is a compositor to put it on.
+
+## What it will need that does not exist yet
+
+- **Text rendering.** Everything here is text, and the console's fixed 8×16
+  CP437 grid is not usable for it. See phase 4 of `docs/roadmap.md` — a real
+  glyph cache and rasteriser, and layout as a library in `lib/` so the
+  terminal and the file manager are not each solving it.
+- **A widget toolkit**, however small. Even a panel needs buttons, labels and
+  hit testing.
+- **A terminal emulator.** Note the direction: the *kernel* console parses
+  ANSI today because it draws directly to the framebuffer. A GUI terminal is
+  a client that parses ANSI itself and renders it with proportional-capable
+  text. The two do not share code.