Support context.timeout in ~/.pwn.conf

[Feyorsh]

(Tested on 4.14.1, unclear when this regression occurred.)

It appears context.timeout cannot be set in ~/.pwn.conf, even though the docs indicate that it can.

Example ~/.pwn.conf:

[context]
timeout = 10

$ python3 -c "from pwn import *"
[!] Unsupported configuration option 'timeout' in section 'context'
[!] Wrong value

This patch fixes this by adding float to the list of types that are allowable to be safeeval'd in update_context_defaults, which does not seem like it should cause issues (although I am new to the codebase, please correct me if I am mistaken).

Perhaps this has slid under the radar because timeout is the only member of context that is affected by this:

>>> import pwnlib
>>> [k for k,v in pwnlib.context.ContextType.defaults.items() if isinstance(v, float)]
['timeout']

[Feyorsh]

This affects stable too, but with the transition away from six I think it's easier to land this in dev

[peace-maker]

This seems like an oversight indeed. Thank you!