Add a new job setting option `autoevalLockable`. Setting this to `true` in
the job compiler's `JOB_TYPE` settings has the following effect:
- By default, the setting will not be editable in Blender's job submission
interface. Instead, a toggle button with a 'car' icon will be shown.
- When the 'car' button is toggled off, the setting becomes editable again.
In its default, uneditable state, the setting will be auto-evaluated before
submission.
This makes it possible to 'lock in' auto-evaluation. The main use case is
for the frame range of the render job. By default this will be locked to
the scene frame range, but it can still be overridden if a different
range is wanted.
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