Fixed -dump flag output and improved search engine argument parsing. #54
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Previously, when passing arguments to the search engine via the "flags" key in a pattern.json file. the argument would be treated as one single, long argument by `exec.Command`. This is fine when passing arguments like `"-rnwE"` (as this is technically a single argument from the perspective of the shell), however if "flags" was instead defined as `"-r -n -w -E"`, it would be passed as one big argument to the search engine, causing errors (e.g. `"invalid option"` in `grep` and `ag`). This patch ensures that multiple arguments defined in a pattern.json file are treated as seperate arguments (e.g. `-r`, `-n`, `-w`, `-E`).
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-dumpflag output to show the custom engine (if configured), rather than always showinggrep.