MacGui: don't mention grayscale twice in the queue display.

Since it's mentioned in the filter summary, we don't need to repeat it in the picture summary.
MacGui: main window and queue improvements.

Merge fPictureSizeField and fPictureCroppingField into fPictureSettingsField (fits on a single line).

Rename fVideoFiltersField to fPictureFiltersField.

Move the two text fields closer to each other now that there is more room.
Also align their contents using tabs.
This should look better overall.

Add pictureSettingsSummary and pictureFiltersSummary to generate the text summaries used in the fields above.
Improvement to the previous commit.
MacGui: simplify queue display code.

Add muxerOptionsSummary method.

Add detailed summaries to the queue item dictionary and use them in HBQueueController.
This helps remove a lot of duplicate logic.
Reduce difference to trunk.
Revert "Reduce difference to trunk."

This reverts commit e28377420d601e6bf26ea297c9ebe26df09a9088.
Final cleanup, 1 of 2.
Final cleanup, 2 of 2.