Added base publishing dialog class. Refs #8537.
Added publishing dialog ui file. Refs #8537.
Override generated form layout. Refs #8537.
Populate combo-box with user investigation IDs. Refs #8537.
Added browser file selection to GUI. Refs #8537.
Added custom publish dialog to catalog menu. Refs #8537.
Updated tooltip message. Refs #8537.
Merge branch 'feature/8537_icat_publishing_gui' into develop