CroPlotR 0.7.0

• Add bind_rows_sim and split_df2sim helper functions to either bind a list of simulations into a single data.frame or to split it back. Works also on observations.
• summary can now be grouped by crops. Useful for cases where we have different usms with different crops, and for intercropping.
• Rename plot saving functions: plot_save -> save_plot_png & save_plot -> save_plot_pdf
• Fix a bug in the legend when plotting two versions in sole crop without observations (only one legend instead of two). See #8039.
• Graphs of residues are no longer plotted with square axes
• Fix an issue on extract_plot for residues plots
• Update documentation
• Several little fixes: added quotes on situation to remove a warning,