Update shift?+ctrl+k|q to match notepad++
Update shift?+ctrl+k|q to match notepad++

In notepad++ this works as follows:

  * ctrl+q       : toggle line comment
  * ctrl+shift+q : add block comment
  * ctrl+k       : add line comment
  * ctrl+shift+k : if present, remove line comment
                   otherwise,  remove enclosing block comment

This patch changes those key bindings to match that more closely.

For reference, notepad++'s default keybindings are defined here:
https://github.com/notepad-plus-plus/notepad-plus-plus/blob/8dea25feb53f5162dc6bece267b3152d2532221f/PowerEditor/src/Parameters.cpp#L144-L148
 
Note that the constants in the file linked above are namedunintuitively:
  * IDM_EDIT_BLOCK_*  : line comment actions.
  * IDM_EDIT_STREAM_* : block comment actions.
See https://github.com/notepad-plus-plus/notepad-plus-plus/blob/ec340000ccde72debc8d0ac721ec376d07dec3e4/PowerEditor/src/Notepad_plus.rc#L321-L325
Microsoft/vscode-notepadplusplus-keybindings