[0.18.27] Mining Productivity research icon shows old electric mining drill

[ajax15]

Hi,

The Mining Productivity research still shows the old icon for the electric mining drill instead of the new icon.

[valneq]

Most research icons have not been touched for a long time. Many icons still display other entities that have been replaced.
For example, look closely at the research icon for "Logistics" and you will see old logistic chest graphics and old cargo wagon graphics. Also the logistic system shows the old logistic chest graphics. The devs know that research icons have to be revisited, and they said they will be working on it after all entities and item icons have been finalized. This was mentioned some time ago. Don't know where the correct source for this statement is, though.

[V453000]

The plan is that before we relase 1.0, we will visit the icons which include designs of old entities, or placeholder icons, hopefully we will have enough time for it.

[Jon8RFC]

Don't forget that although bonus-icon.png is kind of unimportant, it shows up quite a lot in the tech tree.
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