Add support for Java 8 lambdas

[hazzik]

I think that here might be a problem. Because Java's lambdas are interfaces and C#'s lambdas are delegates we can have some problems converting them.

[lilith]

Right now Sharpen can't even run on Java 8, let alone parse it :(

[HankG]

I have a branch that now compiles and runs under Java 8. I have initiated a pull request but it is currently at the head of my master branch https://github.com/HankG/sharpen.

[hazzik]

If anyone interested, I made this working in my fork: https://github.com/hazzik/sharpen-java8/tree/lambda-expressions. There are probably some limitations, but it works for my scenarios.

(No, it did not take 6 years to implement)