Unquoting rules in Desktop Entry spec need more examples

It's really hard to grasp the unquoting rules right.
It would be easier for programmers to implement the spec if there was a
list of examples that could be easily made into unittests on the target
language. Like this:

assert( unescape(`\\$`) == `\$` )
assert( unquote( unescape(`progname "\\$"`) ) == [`progname`, `$`] ) //
clearly say that we need to do both unescape and unquote
/*same story with escaping and quoting*/

Here I used backticks instead quotes to denote strings to avoid escaping on
the language level. It's called raw strings in some programming languages.

Fallible examples also could be added, like this:

assertThrown( unquote(`progname "--dir=%k"`) ) // Field codes must not be
used inside a quoted argument

We could a prepared set of such examples, so anyone who is interested in
implementing the spec could copy this pseudo-code and adapt it to the
language in use and have the ready set of unittests. Also current
implementations could check if their assumptions were right.

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