Consider removing extensions to prototypes of base types in favor of custom functions

[karrtikr]

We're editing the String interface itself by extending String.prototype, the issue with that is that other extensions which might share the same typing names might override our prototypes, for eg. fileToCommandArgument() also exists in Jupyter extension.

Convert all these to functions similar to like we have done with asyncFilter.

[lucyydotp]

+1 for this, especially for replaceAll which is now standard and is breaking other plugins