All action-related code (I think) updated to work with new Action

fsl/data/strings.py

fsl/fsleyes/actions/__init__.py

fsl/fsleyes/actions/loadcolourmap.py

fsl/fsleyes/controls/lightboxtoolbar.py

fsl/fsleyes/controls/orthotoolbar.py

fsl/fsleyes/controls/overlaydisplaypanel.py

fsl/fsleyes/controls/overlaydisplaytoolbar.py

fsl/fsleyes/displaycontext/display.py

fsl/fsleyes/displaycontext/volumeopts.py

fsl/fsleyes/frame.py

fsl/fsleyes/panel.py

fsl/fsleyes/profiles/__init__.py

fsl/fsleyes/profiles/orthoeditprofile.py

fsl/fsleyes/profiles/orthoviewprofile.py

fsl/fsleyes/toolbar.py

fsl/fsleyes/tooltips.py

fsl/fsleyes/views/canvaspanel.py

fsl/fsleyes/views/histogrampanel.py

fsl/fsleyes/views/lightboxpanel.py

fsl/fsleyes/views/orthopanel.py