Add structopt option parsing, use a plain textfile for each user rather than YAML

Cargo.lock

@@ -2,12 +2,53 @@
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@@ -17,6 +58,24 @@ dependencies = [
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@@ -34,18 +93,18 @@ version = "1.0.1"
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@@ -70,12 +129,95 @@ dependencies = [
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@@ -91,6 +233,15 @@ dependencies = [
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@@ -102,6 +253,30 @@ dependencies = [
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 ]
 
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