STM Programmer entry should offer a dropdown list with the values from the other kits

For every single platform I have to provide the same custom values over and over again.

A dropdown box to choose values present from the other kits already present would save a lot of hassle and repetitive settings. It should not select these automatically, just as a suggestion to choose from.

Just found out that this applies for all of the settings, not just the STM programmer.

I have to set the same SDK dir in all of the similar platforms from scratch.