Override the editor in Plugins>Macros>Edit...

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Also override the editor in the toolbar

E.g. when shift-clicking the >> button and selecting Startup Macros.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Override the editor when clicking 'Show macro' in the command finder

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Merge branch 'legacy-editor'

This topic branch tries to plug all the locations where the editor is
called by ImageJ 1.x (it is really astonishing how many different
locations contain essentially the same code simply opening an editor
with a macro...).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>