Update vector layer properties dialog with vertical tabs

- Following subsections still need work: Labeling (ng), Diagrams and possibly more on Style
- Add new SVG icons for Labels, Display and Metadata tabs
- Add up/down, plus/minus icons for consistency
- Move Metadata tab to bottom of list for vector and raster layer property dialogs
- Update report stylesheet (metadata output) to support direct RTF copy/paste (i.e. black-colored fonts)
- Update report stylesheet to use light gray backgrounds for headers instead of unpredictable highlight color