rename_per_fun: Rename objects using speicified function
In hongyuanjia/eplusbuildr: A collection of useful functions to work with eplusr

Rename objects using speicified function

1	rename_per_fun(idf, class, fun = toCamelCase, strict = FALSE)

`idf`	An eplusr::Idf object
`class`	A character vector of classes names
`fun`	A function to take the corresponding object names as input, process them and return a character vector with the same length. `fun` can be a named character vector. In this case, when specified object names match element value, the element name will be used as the new name. If `NULL`, nothing will be done. Default: toCamelCase
`strict`	If `TRUE`, an error will be issued if the newly generated object names contain duplications. If `FALSE`, make.unique will be called to make sure there are no duplications. Default: `FALSE`