Asammdf

Fixes
* keep the CAN ID as hex in the tabular window (extensible to other bus logging custom fields as well)
* apply new prefix immediately in the tabular window
* use 29bit mask for CAN ID's

Changes
* add to_config method to FileWidget

Standalone GUI builds
* [Linux](https://ci.appveyor.com/project/danielhrisca/asammdf/builds/28879800/job/e4o1mofty9p17xt8/artifacts)
* [Windows](https://ci.appveyor.com/project/danielhrisca/asammdf/builds/28879800/job/cpu52dgfvgl9r9r8/artifacts)

Fixes
* close temporary files in _concatenate_, _to_dataframe_ and _stack_
* correctly set IDBLOCK fields after finalization procedure
* keep CAN ID display as hex values in the tabular window after applying filters
* monkey patch canmatrix.Signal.set_startbit (for handling Motorola signals)
* fix select all and reset channel selection in GUI
* change get_master argument from _one_peace_ to _one_piece_
* do not duplicate dbc files in the CAN export tab
* improve robustness of loading display configuration with computed channels

Fixes
* copy ranges when copying display properties

Fixes
* fix error when canceling a computation channel dialog

Fixes
* properly close intermediate files in the concatenate and stack methods
* fix drag & drop for numeric window
* fix for wrong channel group info

Changes
* handle already transposed bytes in DZBLOCK

Changes
* added context menu to the plot's channel list selection