[Needs Documentation Update] Arrange keywords editor widgets into tabs.
Added missing rubber bands icons to resource file.
Further tweaks for keywords editor tab support - in progress
Resolved merge conflicts with origin
Added missing label on keywords dialog
Updates for keywords editor to use tabs etc.
Completed refactor of keywords editor to use tab for aggregation properties.
Fix for keywords editor throwing error when raster layers are used.
All keywords editor dialog tests passing.
#1052 Fi x keywords editor issues reported by @akbargumbiar
Merge pull request #1052 from timlinux/develop

Improve layout of keywords dialog