Keyboard shortcuts difference from expectations: select rows, then select columns

[naterush]

Describe the bug

Users expect that this is the same as a Control + A -- but instead, it ends up selecting a strange selection.

To Reproduce

1. Click a cell
2. Click Control + Space
3. Click Shift + Space
4. See that this is not the same pressing command + A

Fix

We should make it so all various selections dealing with only -1 will end up looking like an entire selected dataframe. Also, the Select_Columns and Select_Rows actions probably need to be updated.