Add enum for media keys on Win32
user
```coffeescript
module.exports =
    APPCOMMAND_BROWSER_BACKWARD:                 1
    APPCOMMAND_BROWSER_FORWARD:                  2
    APPCOMMAND_BROWSER_REFRESH:                  3
    APPCOMMAND_BROWSER_STOP:                     4
    APPCOMMAND_BROWSER_SEARCH:                   5
    APPCOMMAND_BROWSER_FAVORITES:                6
    APPCOMMAND_BROWSER_HOME:                     7
    APPCOMMAND_VOLUME_MUTE:                      8
    APPCOMMAND_VOLUME_DOWN:                      9
    APPCOMMAND_VOLUME_UP:                        10
    APPCOMMAND_MEDIA_NEXTTRACK:                  11
    APPCOMMAND_MEDIA_PREVIOUSTRACK:              12
    APPCOMMAND_MEDIA_STOP:                       13
    APPCOMMAND_MEDIA_PLAY_PAUSE:                 14
    APPCOMMAND_LAUNCH_MAIL:                      15
    APPCOMMAND_LAUNCH_MEDIA_SELECT:              16
    APPCOMMAND_LAUNCH_APP1:                      17
    APPCOMMAND_LAUNCH_APP2:                      18
    APPCOMMAND_BASS_DOWN:                        19
    APPCOMMAND_BASS_BOOST:                       20
    APPCOMMAND_BASS_UP:                          21
    APPCOMMAND_TREBLE_DOWN:                      22
    APPCOMMAND_TREBLE_UP:                        23
    APPCOMMAND_MICROPHONE_VOLUME_MUTE:           24
    APPCOMMAND_MICROPHONE_VOLUME_DOWN:           25
    APPCOMMAND_MICROPHONE_VOLUME_UP:             26
    APPCOMMAND_HELP:                             27
    APPCOMMAND_FIND:                             28
    APPCOMMAND_NEW:                              29
    APPCOMMAND_OPEN:                             30
    APPCOMMAND_CLOSE:                            31
    APPCOMMAND_SAVE:                             32
    APPCOMMAND_PRINT:                            33
    APPCOMMAND_UNDO:                             34
    APPCOMMAND_REDO:                             35
    APPCOMMAND_COPY:                             36
    APPCOMMAND_CUT:                              37
    APPCOMMAND_PASTE:                            38
    APPCOMMAND_REPLY_TO_MAIL:                    39
    APPCOMMAND_FORWARD_MAIL:                     40
    APPCOMMAND_SEND_MAIL:                        41
    APPCOMMAND_SPELL_CHECK:                      42
    APPCOMMAND_DICTATE_OR_COMMAND_CONTROL_TOGGLE:43
    APPCOMMAND_MIC_ON_OFF_TOGGLE:                44
    APPCOMMAND_CORRECTION_LIST:                  45
    APPCOMMAND_MEDIA_PLAY:                       46
    APPCOMMAND_MEDIA_PAUSE:                      47
    APPCOMMAND_MEDIA_RECORD:                     48
    APPCOMMAND_MEDIA_FAST_FORWARD:               49
    APPCOMMAND_MEDIA_REWIND:                     50
    APPCOMMAND_MEDIA_CHANNEL_UP:                 51
    APPCOMMAND_MEDIA_CHANNEL_DOWN:               52
    APPCOMMAND_DELETE:                           53
    APPCOMMAND_DWM_FLIP3D:                       54
```
assistant