We mostly use classical C strings, but the memory management around them
can get confusing and error prone. Let's use std::string for the cases
where we need to return a newly allocated string.

We know the needed space here, so let's keep it simple with a constant
size string buffer.

We never use Windows' "UNICODE" mode anyway, so let's get rid of this
complexity.

This makes memory management more clear and robust when using these
helper functions.

Applets don't work anymore so remove everything that has to do
with serving them.

We use polymorphic exception objects, so catching by value invokes
the copy constructor and stuff that we don't really want.

We have lots of code that deals with Windows versions that we no
longer support anyway. Clean out all of this old cruft.

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