New functions to remove words from strings

After creating and collecting functions regarding string manipulation in the script, I today decided to finally include them in my package. Since I’m right now trying to match more or less similar names in our database to avoid double entries, I came up with some useful functions, especially if you use them in combinations with the tidyverse-packages. Because this script became quite messy, I picked those functions that might be useful again sometimes and source them from my package from now on. Especially the str_remove*-functions are nice if you for example have to deal with companies and—for some reason—they sometimes have different entities or abbreviations, making it hard to match or even find possible candidates using agrep() or stringdist::stringsim(). Using string_remove_not_left(string = "Some Company Limited Co", remove_words = c("Some", "Limited", "Co")) becomes Some Company (and not Company, because of not using string_remove_only_left() or string_remove()) and hence makes it more likely to find proper matches using for example stringdist::stringsim() for typo-detection.