Revamp how addons work

- Addons now nest, which means that addons can manage addons. This has a number
of salutary effects - the scripts addon no longer has to poke into the global
addons list, we no longer have to replace/remove/boot-outof parent addons when
we load scripts, and this paves the way for making our top-level tools into
addons themselves.
- All addon calls are now wrapped in a safe execution environment where
exceptions are caught, and output to stdout/stderr are intercepted and turned
into logs.
- We no longer support script arguments in sys.argv - creating an option
properly is the only way to pass arguments. This means that all scripts are
always directly controllable from interctive tooling, and that arguments are
type-checked.

For now, I've disabled testing of the har dump example - it needs to be moved
to the new argument handling, and become a class addon. I'll address that in a
separate patch.

1 files changed, 1 insertions, 4 deletions

diff --git a/examples/simple/io_write_dumpfile.py b/examples/simple/io_write_dumpfile.py
index 15e7693c..a0956e33 100644
--- a/examples/simple/io_write_dumpfile.py
+++ b/examples/simple/io_write_dumpfile.py
@@ -23,7 +23,4 @@ class Writer:
             self.w.add(flow)
 
 
-def load(l):
-    if len(sys.argv) != 2:
-        raise ValueError('Usage: -s "flowriter.py filename"')
-    l.boot_into(Writer(sys.argv[1]))
+addons = [Writer(sys.argv[1])]