TO-DO: echo back chosen recording name when loading D0x files.

#ToDo 

- Add a print statement that will allow the user to see which recording name has been loaded when using the GUI window. 

For example, the current behavior is:

`rec_dt <- load_d0x_files()`
`Please select one of the .Dxx files...`

However, it should look like:

`rec_dt <- load_d0x_files()`
`Please select one of the .Dxx files...`
`Loading recording "24h_LD_LL_Rep3-ch1"`