Allow attaching (remote and local) with no program #262
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There is no strict need to have a program passed to GDB when attaching (remote or local). Either the program can be downloaded from the remote or otherwise read by GDB, or if not possible then GDB can do symbol-free debugging.
Previously in #228 some work was done to better error when program was not specified. This change loosens the restrictions slightly. If the program is not specified, it is still a warning in VSCode because of
package.json
See this comment for how it is presented to a user: #261 (comment)
Part of #261