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, 2 deletions

diff --git a/examples/complex/dns_spoofing.py b/examples/complex/dns_spoofing.py
index 01e036b2..632783a7 100644
--- a/examples/complex/dns_spoofing.py
+++ b/examples/complex/dns_spoofing.py
@@ -54,5 +54,4 @@ class Rerouter:
         flow.request.port = port
 
 
-def load(l):
-    l.boot_into(Rerouter())
+addons = [Rerouter()]