Shellchat quality of life enhancements

[spoelstraethan]

It appears that only the D pad click is currently mapped (globally).

Please consider adding a history recall with D pad Up for editing/re-running a query (after adding a new credential/base for example) in addition to the very helpful history display.

In addition a way to scroll back the output using Shift + D pad Up would be amazing since the more that gets added to the device the longer the output of different commands will grow.

It would also be awesome if there was a VERY rudimentary cursor for editing text in the "command line" without deleting and retyping the entire command by using D pad Left and D pad Right to place the cursor.

I don't think we need a full readline with history search etc, but it also occurred to me that using the D pad Right to do a basic "completion" based on what is already typed and then using the left half of the "history" line to show possible completions and the last couple commands run on the other half (or the whole thing if a completion wasn't requested).