Fix 726 improve dap compilation #840
                
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Fixes issue #726
There were some bugs in the way the TASKS were being check. It also set the hook for
compilation-startafter the functions was already called and banked on the fact that the command took long enough for us to set the hook, which seem like a strange thing to do.Also added two options:
dap-debug-compilation-keep-bufferto allow deleting the buffer on success.dap-debug-compilation-same-bufferto allow the commands to run on the same buffer without clearing the buffer.