Rename mapping

[smasongarrison]

This pull request introduces a new feature for customizable column name standardization and makes related documentation and export updates. The main change is the enhancement of the standardizeColnames function to allow users to provide a custom mapping for column renaming, improving flexibility for different data sources. Documentation has been updated to reflect these changes, and the function is now exported for external use. Additionally, there are minor improvements to example usage and visualization in the ASOIAF vignette.

Column name standardization enhancements

• The standardizeColnames function now accepts a mapping argument, allowing users to provide custom mapping options for column name standardization. This makes the function more flexible and adaptable to varying data formats. (R/cleanPedigree.R, [1] [2]
• The function is now exported and documented for external use, making it accessible as part of the package's public API. (NAMESPACE, [1]; man/standardizeColnames.Rd, [2] [3]

Documentation improvements

• Updated documentation for the standardizeColnames function to describe the new mapping argument and its usage. (man/standardizeColnames.Rd, [1] [2]
• Minor formatting improvements to data documentation blocks for improved clarity and consistency. (R/documentData.R, [1] [2]

Vignette and example updates

• Added ggpedigree library and improved pedigree visualization examples in the ASOIAF vignette, including usage of ggPedigree for enhanced plotting. (vignettes/ASOIAF.Rmd, [1] [2]