Update: add missing dependencies, changes to iki

Update: add missing dependencies, changes to iki

In a previous commit I seem to have forgotten to include the build settings changes.

Fix some minor mistakes in iki.
In particular, I forgot to increment the range->start after identifying where content would begin (which prevented it from working at all).

Add f_iki_variable to store the range for the entire variable.
This will allow for easy removal when substituting (which is one of the design intentions, so I need to cover this use case!).