Suggestion: config to change color of selected commits

**Is your feature request related to a problem? Please describe.**
1. Copy a commit

In some terminal themes (I'm using [`base16-chalk.dark.256`](https://github.com/chriskempson/base16-iterm2/blob/999a99df6558c5b32e7554548723cebfc5a006ea/base16-chalk.dark.256.itermcolors)), the commit will become unreadable:


I had the same problem with selected lines in the files panel, which I was able to fix using:

```yml
selectedLineBgColor:
- reverse
```

**Describe the solution you'd like**
Perhaps we need another option for selected commits, or an option that controls the colour of all selected text (both commits _and_ lines).

**Describe alternatives you've considered**

**Additional context**