Improve Icons Shown in Algorithm Dialogs

[Peter Parker]

Some feedback from Nick, suggesting some changes to the features introduced by #2480:

1. Change the "Restored" icon to be something that denotes "history" a little better. A clock, or similar.
2. Have the new history icon be clickable, so that a user may toggle whether or not they'd like to use the value they entered last time. "Striking through" the icon seems sensible in this case.
3. Change the "Replace" icon to be a "!" warning sign. Hopefully this makes things a little clearer. This won't be clickable.
4. Change the red asterisk to something that matches the size of the other icons.

[Peter Parker]

Refs #9437 - Change icons and their behaviour.

Changeset: 311d4b41876e8abbf9a44ec00076d2c77a9ba19c

[Peter Parker]

To test, make sure the four changes proposed in the description have been implemented. When testing the history toggle, please make sure you test Bool, Option, Text and File PropertyWidgets, since the code for dealing with history in each case is slightly different. A nice algorithm to use here is CalibrateRectangularDetectors, which has a lot of properties.

Note that the scope of this ticket is the same as #2480, i.e. #9149 exists to spread the property widgets to all the other custom dialogs (i.e. LoadAscii, CatalogPublish, etc).

Also note that #9356 exists to fix a width problem with some of the alg dialogs with larger property names.

[Peter Parker]

(In #9372) Fixed this as part of #9437. Set that ticket as a blocker to this one.

[Peter Parker]

Refs #9437 - fix unused var warning.

Changeset: efcd589a0b1a72ef353f9896d94baff4db073acb

[Nick Draper]

I really like the click to ignore / return historic values

[Nick Draper]

Merge remote-tracking branch 'origin/feature/9437_improve_alg_diag_icons'

Full changeset: ​22b319f46e41aab263c5480d32a6b1f076e8b618

[Stuart Campbell]

This ticket has been transferred to github issue ​10280