Add support of passing jvm arguments to "ceylon" command

Desired syntax is something like ceylon run foo.bar.baz/3.2.2 --jvm-opts="-Xcomp XX:+PrintStubCode". At the moment this can be achieved by putting arguments to environment variable $JAVA_OPTS

[lucaswerkmeister]

Thank you, you did the hard work – I had the fortune to work with a sensible language 😉

[quintesse]

@lucaswerkmeister I think I finally got something that works. Turns out you can at least quote arguments with special characters by simply surrounding them with double quotes, you just have to be careful how you use the variables that handle them inside the scripts (with or without quotes, using things like %~xx etc).

But that still leaves us with the fact that you might see an example written for Linux/Mac like in my previous message that won’t work without being quoted. So I decided to add an error message that, if you use the unquoted version, will give you:

Error: use --java options with an equal sign and quotes, eg: "--java=-Xmx500m"

I think this is the best we can do.