Improve compatibility of clades definition file and update main_depict_clades.R

[JuseTiZ]

①、update main_depict_clades.R

Warning messages: In type.convert.default(X[[i]], ...) : 'as.is' should be specified by the caller; using TRUE

When this occurs, R does not convert character vectors into factor vectors, which leads to certain functions (like levels()) returning NULL and subsequently, the inability to properly generate plots.

②、Improve compatibility of clades definition file

Make the taxa in the clades definition file can be read correctly without double quotes.