reduce textual 'noise' in the EOS event debug log entries

This makes the event entries in the log from an EOS more readable by
removing uninteresting information and layout out interesting information
in a more aligned/table based manner for quick visual parsing of the data.

Example excerpt:
```
event 104: EOS prop d1c9 value changed, size  4 (EOS_ContinousAFMode)
           value of d1c9 is 0x00000000 (u32)
event 105: EOS prop d19f value changed, size  4 (EOS_GPSDeviceActive)
           EOS prop d19f is unknown
           value of d19f is 0x00000001 (u32)
[...]
event 111: EOS prop d177 value changed, size 24 (EOS_SmartphoneShowImageConfig)
    0x000: 18 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    0x010: 00 00 00 00 00 00 00 00
event 112: EOS prop d105 options changed, type 1, count  0 (EOS_AutoExposureMode)
event 113: EOS prop d108 options changed, type 3, count  3 (EOS_FocusMode)
           option[ 0] of d108 is 0x00
           option[ 1] of d108 is 0x02
           option[ 2] of d108 is 0x01
```