all_pathways_heat_pca: Draw the heatmap and PCA on genes of different pathways
In Yutong441/TBdev: Infer a Trophoblast Developmental Trajectory

Draw the heatmap and PCA on genes of different pathways

all_pathways_heat_pca(
  x,
  save_dir,
  all_path = NULL,
  highlight_cells = NULL,
  DE_dir = NULL,
  DE_label = NULL,
  species = "human"
)

`x`	a Seurat object
`save_dir`	where outputs will be saved. For each pathway, one pdf file will be made, including the PCA in the first page, heatmap the second, and truncated heatmaps if the heatmap is too dense
`all_path`	a dataframe with 2 columns: 'pathway' for the common names of the pathway that is used for naming the output file, and 'kegg_id' for the KEGG ID for that pathway. This ID may be obtained from: https://www.genome.jp/kegg/pathway.html
`highlight_cells`	which cells to highlight in the PCA and heatmap