Provide a method to allow reading advice from file

[hasekawa-takumi]

Adds an extra, optional command line option which allows to initialize FixedAdviceProvider to the binary content of the file. This will allow easier test framework building.

[thealmarty]

• is there a test for this?
• I thought there was a security concern, which is why we are only accepting input from stdin atm. We need to check more things for files to avoid security risk.

[hasekawa-takumi]

• is there a test for this?
• I thought there was a security concern, which is why we are only accepting input from stdin atm. We need to check more things for files to avoid security risk.

I don't see a concern about security by using file as inputs? But I do see it is possible to pipe binary file to stdin for a same effects.

[thealmarty]

I don't see a concern about security by using file as inputs? But I do see it is possible to pipe binary file to stdin for a same effects.

I guess that would be scriptable too. I don't really like any of this actually >.<

[morganthomas]

I agree this is kinda hard to test, but I also don't have any major concerns about merging this. I'm not sure what Marty's security concerns are but maybe that can be clarified.