Update build system and docs - phase 2
missed a file
Fix trivial deprecations
Migrate to GtkUIManager
drop libgnome dependency
combo -> comboboxtext switch
Fix font buttons
Deal with GSEAL_ENABLE
libglade -> GtkBuilder move
Switch to gtk3
Use GtkGrid in preferences
Use GtkGrid in worddic (instead of GtkTable)
Use GtkGrid in kanjidic (instead of GtkTable)
Use GtkExpander for hiding worddic options
Use GtkGrid (instead of GtkBox) in worddic and tweak the expander
Use GtkGrid (instead of GtkBox) in kanjidic
Update .gitignore files
Remove redundant configure defines
minor docs syntax change
Fix the docs for xmlto