Removing import hoisting behaviour

[asottile]

Covered by Tests/Cheps.py

[asottile]

I took a crack at this. It's a little more difficult than what it says on the tin for the following reason:

"module" level imports get stuck into the respond method which is broken imo. Need to add some code to special case module level imports. Also the import code is unnecessarily complicated in the current state. Might even be able to leverage ast instead of the manual parsing it currently does.

[asottile]

The logic has gotten much simpler (leveraging ast):

yelp_cheetah/Cheetah/legacy_compiler.py

Line 595 in c38ac9d

def _add_import_statement(self, imp_statement, line_col):

This is however still an issue