Nyall Dawson d57a638ec4 Add a processing algorithm flag to indicate that an algorithm requires
a valid project to be set in the context in order to execute

And flag a bunch of algorithms which require this
2020-07-30 08:26:40 +10:00
..
2020-05-18 13:55:44 +08:00
2020-05-05 23:22:12 +02:00
2020-07-21 12:51:48 +02:00