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

[axxel]

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