Release 4.6.0

Fixes

• fix big endian handling of channels that have bit offset or non standard size
• fix Signal cut method
• fix MDF concatenate method
• fix benchmark script for new internal package structure
• fixes in plotting
• correctly use np.append when extending Signals

Changes

• add include_ends argument to Signal cut method
• remove cantools and matplotlib from requirements
• add record_offset argument to MDF select and MDF4 get methods
• MDF4 compressed blocks speed optimizations