Release 5.8.1

Fixes

• handle common axis label color depending of the plot background
• fix highlight issue in dark theme
• fix signal stack and fit in the plots
• fix flickering in GUI in case of mat export
• increase float constant precision when adding computed channels

Changes

• improve initial plot display speed
• use a single button for plot, numeric and tabular window creation
• add plot function
• add tabular window (issue #183)
• add file information tab
• remove missing CAN metadata warning
• remove dataframe argument from the select method
• add copy method to Signal
• apply sub-plot link to numeric windows
• add ignore_value2text_conversions argument to select and to_dataframe