Issue #913 - fix TimeControllerView.java #2332 so it replaces spaces with underscores in icon filename

Required icons:
icons/default_highlight.png
icons/symbol_highlight.png
icons/range_ring_highlight.png
icons/highlight_off.png

Plugin: org.mwc.cmap.TimeController
Issue #913 - use new file_type icons in Navigator window (16px, sensor_file, track_file, plot_file)
Issue #913 - Adding the 16px icons in the Outline label provider
Merge pull request #914 from pecko/issue913

Issue #913 - More UI update issues #913