Promote runtime stuff to lib (#74)

WoofWare.NUnitTestRunner.Lib/RuntimeConfig.fs

@@ -0,0 +1,51 @@
+namespace WoofWare.NUnitTestRunner
+
+open System
+open WoofWare.Myriad.Plugins
+
+[<JsonParse>]
+type internal FrameworkDescription =
+    {
+        Name : string
+        Version : string
+    }
+
+[<JsonParse>]
+type internal RuntimeOptions =
+    {
+        Tfm : string
+        Framework : FrameworkDescription option
+        Frameworks : FrameworkDescription list option
+        RollForward : string option
+    }
+
+[<JsonParse>]
+type internal RuntimeConfig =
+    {
+        RuntimeOptions : RuntimeOptions
+    }
+
+[<RequireQualifiedAccess>]
+type internal RollForward =
+    | Minor
+    | Major
+    | LatestPatch
+    | LatestMinor
+    | LatestMajor
+    | Disable
+
+    static member Parse (s : string) : RollForward =
+        if s.Equals ("minor", StringComparison.OrdinalIgnoreCase) then
+            RollForward.Minor
+        elif s.Equals ("major", StringComparison.OrdinalIgnoreCase) then
+            RollForward.Major
+        elif s.Equals ("latestpatch", StringComparison.OrdinalIgnoreCase) then
+            RollForward.LatestPatch
+        elif s.Equals ("latestminor", StringComparison.OrdinalIgnoreCase) then
+            RollForward.LatestMinor
+        elif s.Equals ("latestmajor", StringComparison.OrdinalIgnoreCase) then
+            RollForward.LatestMajor
+        elif s.Equals ("disable", StringComparison.OrdinalIgnoreCase) then
+            RollForward.Disable
+        else
+            failwith $"Could not interpret '%s{s}' as a RollForward"