Semantics of `import` statements

Now it's time to get serious with the module system. I think of this model:

When you import an identifier, you are exclusively referring to the standard library. When you do an import like this:
```
from utils import map
```
You are looking for the map symbol in the utils module of the standard library.
When you import a string, you are looking for a path (or maybe an URI!):
```
from "./foo.komodo" import bar
```
You are looking for the bar symbol in the foo.komodo file that is in the same directory as the file where this line is.

danilopedraza / komodo