Add the browse command

Signed-off-by: nppangband <nppangbanddev@verizon.net>
Add use_item and activate commands.

Signed-off-by: nppangband <nppangbanddev@verizon.net>
Merge branch 'Jeff'


Signed-off-by: nppangband <nppangbanddev@verizon.net>
Merge branch 'diego' of https://github.com/nppangband/NPPAngband_QT.git into Jeff
Signed-off-by: nppangband <nppangbanddev@verizon.net>
Merge branch 'master' of https://github.com/nppangband/NPPAngband_QT into diego
Merge branch 'Jeff' of https://github.com/nppangband/NPPAngband_QT into diego