Fix make compile_commands.json and add to vscode project settings
#96
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Because no specific shell was set in the Makefile it defaults to /bin/sh which has a built-in version of echo that does not accept the -n option and instead will write -n to stdout.
Setting the shell to /bin/bash means we will use bash and bashs's built-n echo which does support the -n option, which means we will start generating a valid JSON file for compile_commands.json