Add utilities.

* OS has moved into a sub-folder
* The build script now builds a ROM FS
* OS gains a "rom" command which can load ELF files from ROM
* The old "loadf" command is gone (I never used it)
* Added a "flame" utility, as a placeholder

Author: thejpster

.github/workflows/rust.yml

@@ -22,16 +22,25 @@ jobs:
 
       - name: Install Targets and Tools
         run: |
+          rustup toolchain install stable --profile minimal --no-self-update
+          rustup default stable
           rustup target add thumbv7em-none-eabi
           rustup target add thumbv7m-none-eabi
           rustup target add thumbv6m-none-eabi
           rustup component add llvm-tools-preview
+          echo CARGO_INCREMENTAL=0 >> $GITHUB_ENV
+          echo CARGO_TERM_COLOR=always >> $GITHUB_ENV
   
       - name: Install tools
         uses: taiki-e/install-action@v2
         with:
           tool: [email protected]
 
+      - name: Install ROMFS tools
+        run: |
+          cargo install --git https://github.com/neotron-compute/neotron-romfs.git neotron-romfs-lsfs
+          cargo install --git https://github.com/neotron-compute/neotron-romfs.git neotron-romfs-mkfs
+
       - name: Build
         run: |
           ./build.sh --verbose