Add Intellij IDEA *.gdsl file for *.sshoogr scripts

[aadamovich]

No description provided.

[ddimtirov]

Instead of that, you may want to use the @DelegatesTo and @ClosureArguments annotations - they are part of the language and IDEA (mostly) supports them.

[aadamovich]

Latest commit of sshoogr already has @DelegatesTo annotations. For @ClosureArguments, we need to upgrade to Groovy 2.x first. We are postponing it a bit for Gradle 1.x integration to still work.

Besides, *.gdsl file is mostly for custom extension support i.e. *.sshogr, which we will introduce in one of the next releases that adds default imports and methods to the scripts to avoid some biolerplate code