7842 - new directory organization

Baremetal is now the default build target and therefore has its sources
at the top-level. Baremetal programs build using the phase-2 Mu toolchain
that requires a Linux kernel. This phase-2 codebase which used to be at
the top-level is now under the linux/ directory. Finally, the phase-2 toolchain,
while self-hosting, has a way to bootstrap from a C implementation, which
is now stored in linux/bootstrap. The bootstrap C implementation uses some
literate programming tools that are now in linux/bootstrap/tools.

So the whole thing has gotten inverted. Each directory should build one
artifact and include the main sources (along with standard library). Tools
used for building it are relegated to sub-directories, even though those
tools are often useful in their own right, and have had lots of interesting
programs written using them.

A couple of things have gotten dropped in this process:
  - I had old ways to run on just a Linux kernel, or with a Soso kernel.
    No more.
  - I had some old tooling for running a single test at the cursor. I haven't
    used that lately. Maybe I'll bring it back one day.

The reorg isn't done yet. Still to do:
  - redo documentation everywhere. All the README files, all other markdown,
    particularly vocabulary.md.
  - clean up how-to-run comments at the start of programs everywhere
  - rethink what to do with the html/ directory. Do we even want to keep
    supporting it?

In spite of these shortcomings, all the scripts at the top-level, linux/
and linux/bootstrap are working. The names of the scripts also feel reasonable.
This is a good milestone to take stock at.

1 files changed, 43 insertions, 0 deletions

diff --git a/editor/atom/grammars/subx.json b/editor/atom/grammars/subx.json
new file mode 100644
index 00000000..8ba8c077
--- /dev/null
+++ b/editor/atom/grammars/subx.json
@@ -0,0 +1,43 @@
+{
+    "scopeName": "source.subx",
+    "name": "SubX",
+    "fileTypes": ["subx"],
+    "patterns": [
+        {
+            "name": "header-comment.subx",
+            "match": "# - .*"
+        },
+        {
+            "name": "comment-sub-2.subx",
+            "match": "# \\. \\. .*"
+        },
+        {
+            "name": "comment-sub-1.subx",
+            "match": "# \\. .*"
+        },
+        {
+            "name": "comment.subx",
+            "match": "#.*"
+        },
+        {
+            "name": "strings.subx",
+            "match": "\"[^\"]*\""
+        },
+        {
+            "name": "test.subx",
+            "match": "^test-[^ ]*:"
+        },
+        {
+            "name": "global.subx",
+            "match": "^[A-Z][^ ]*:"
+        },
+        {
+            "name": "function.subx",
+            "match": "^[^_$ #][^ ]*:"
+        },
+        {
+            "name": "label.subx",
+            "match": "^[_$][^ ]*:"
+        }
+    ]
+}