Nim: Move a few factories to their product's compilation units

There's several hundred kBytes extra for the separate .o in a
debug build, this doesn't scale well for a handful lines of code.

As the Nim plugin is a nice template for others elsewise, it would
be nice to use scalable patterns only.

Change-Id: I78e473d28a6a63d458dcbe06a77d93221867417f
Reviewed-by: Filippo Cucchetto <filippocucchetto@gmail.com>
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/nim/project/nimrunconfiguration.cpp

@@ -130,4 +130,13 @@ void NimRunConfiguration::setActiveBuildConfiguration(NimBuildConfiguration *act
     }
 }
 
+// NimRunConfigurationFactory
+
+NimRunConfigurationFactory::NimRunConfigurationFactory()
+{
+    registerRunConfiguration<NimRunConfiguration>(Constants::C_NIMRUNCONFIGURATION_ID);
+    addSupportedProjectType(Constants::C_NIMPROJECT_ID);
+    addFixedBuildTarget("-TempRunConf");
+}
+
 }