[build] Move to python build scripts per module

This change moves Bonnibel from a separate project into the jsix tree,
and alters the project configuration to be jsix-specific. (I stopped
using bonnibel for any other projects, so it's far easier to make it a
custom generator for jsix.) The build system now also uses actual python
code in `*.module` files to configure modules instead of TOML files.
Target configs (boot, kernel-mode, user-mode) now moved to separate TOML
files under `configs/` and can inherit from one another.

assets/initrd.toml

@@ -1,28 +0,0 @@
-# This is the manifest for the initial ramdisk, read by the `makerd` tool.
-# The contents should be a table array of files to add to the ramdistk:
-#
-#  [[files]]
-#  dest = "foo.bar"             # Name of the file in the ramdisk
-#  source = "build/foo/foo.bar" # Location of the file from the project root
-#  executable = true            # Optional, default false. Whether this is an
-#                               # initial application for the kernel to execute
-#                               # on startup
-
-[[files]]
-dest = "screenfont.psf"
-source = "../assets/fonts/tamsyn8x16r.psf"
-
-[[files]]
-dest = "symbol_table.dat"
-source = "symbol_table.dat"
-symbols = true
-
-[[files]]
-dest = "nulldrv1"
-source = "user/nulldrv"
-executable = true
-
-[[files]]
-dest = "nulldrv2"
-source = "user/nulldrv"
-executable = true

assets/manifests/default

@@ -0,0 +1,5 @@
+kernel,kernel
+kernel,panic.serial
+user,drv.uefi_fb
+user,testapp
+user,srv.init