Make generic connectors easily identifiable

[failiz]

Problem

There are new users who do not not hot to create pin headers or other connectors (e.g. #4275). This happens as the icons and information of these parts do not show that they can be configured. In the image below (cursor over part in the bin), it seems that it is a part for a 2 pin connector. New users do not think this can be changed later in the sketch.

Proposed Solution

2 things to improve this situation:

• Improve the text that appears when the cursor is on top of the part in the bin. For example: "Generic female header. Configurable number of pins"
• Improve the icon of the configurable parts. For example, something like below:

[KjellMorgenstern]

And even when selecting a header in the Parts widget, the Inspector still doesn't offer customization until the part was actually placed in the sketch (this is #4277 ).