Add MicroCrystal RV-3028-C7 RTC symbol

Add MicroCrystal RV-3028-C7 RTC symbol

Two-page datasheet: https://www.microcrystal.com/fileadmin/Media/Products/RTC/Datasheet/RV-3028-C7.pdf

Application manual (full datasheet): https://www.microcrystal.com/fileadmin/Media/Products/RTC/App.Manual/RV-3028-C7_App-Manual.pdf

This new symbol is based on the geometry of existing RV-8523-C3 symbol. EVI is an input pin unique to RV-3028-C7, and CLKOUT is now a push-pull output pin (see page 9 of application manual; as opposed to open-drain in RV-8523-C3).

Footprint MR: kicad-footprints!3680 (merged)

Footprint Generator MR: kicad-footprint-generator!1166 (merged)

Thanks!