Goto in disassembled code #577

CLion has the ability to Set Execution Point (Goto in terms of DAP) in disassembled code. I want to propose a new optional field instructionReference for GotoTargets request and DisassembledInstruction. This allows clients to easily implement this feature (e.g. sending GotoTargets request with instructionReference from the selected instruction and Goto after that). Also, we need new capability for that like supportsGotoInstruction. VS Code as a reference DAP implementation already has some buttons for instructions in disassembly view, so it should not be a lot of work to add this feature in UI.