{lib}mediainfo{-gui}: 0.7.81 -> 0.7.82

Built and tested locally.

From the changelog:
```
Version 0.7.82, 2016-01-27
+ Matroska: CRC-32 validation
+ Matroska: support of padding/junk at the start of a segment
+ Matroska: trace is activated for all elements (but report is still
  based on the first element met)
+ Matroska: add an intermediate level in the trace for the raw stream
  parser
x FLV: potential infinite loop fixed
x #B966, DTS: DTS-HD HR 3840 not detected anymore
x AC-3: wrong sample rate with 32 kHz streams
x #B948, EBUCore 1.6: invalid output due to position of
  containerEncoding element
x #B957, MPEG-7 output: No XML encoded value output
```