Change "Site_Type" and "Index_Region" to "Index_Class"

[leppott]

Is your feature request related to a problem? Please describe.
Have used Site_Type and Index_Region in multiple places between BioMonTools and BCGcalc packages.

Change to "Index_Class"

Describe the solution you'd like
Will need to deprecate the input parameter in files.

Describe alternatives you've considered
Need consistency between packages.

Additional context
Will have to change:

• functions (input parameters)
• examples
• example files.
• vignettes
• other?

[leppott]

• ext\DataBenthos.xlsx
• ext\MetricFlags.xlsx
• ext\MetricScoring.xlsx
• qc_checks.R
• metric_values.R
• metric_values_excel.R
• metric_scores.R
• data.R
• data-raw\data_benthos_MBSS
• data-raw\data_benthos_PacNW
• data-raw\data_diatom_mmi_dev
• data-raw\data_diatom_mmi_qc
• data-raw\data_fish_MBSS
• data-raw\metval_SCMB_IBI
• data-raw\data_mmi_dev
• vignette
• Shiny,

[leppott]

Calculation slower. Will need to fix.

Modified mutate, if_numeric, replace_na statement to use a data frame and not a tibble. The grouping was making it take minutes instead of < 2 seconds.