command: Fix reload command to correctly initialize and reload all runtime files (#3062)

* rtfiles: Initialize all-/realFiles and Plugins in InitRuntimeFiles

* command: Reload plugins at ReloadCmd too

* command: Don't reload plugins in case of ReloadConfig()

* rtfiles: Split InitRuntimeFiles() into one func for assets and one for plugins

* rtfiles: Remove the unnecessary init function

With this modification the InitRuntimeFiles() and InitPlugins() (if needed)
must be called first, otherwise uninitialized runtime file variables are most
likely.

cmd/micro/micro.go

@@ -255,6 +255,8 @@ func main() {
 	}
 
 	config.InitRuntimeFiles()
+	config.InitPlugins()
+
 	err = config.ReadSettings()
 	if err != nil {
 		screen.TermMessage(err)

cmd/micro/micro_test.go

@@ -36,6 +36,8 @@ func startup(args []string) (tcell.SimulationScreen, error) {
 	}
 
 	config.InitRuntimeFiles()
+	config.InitPlugins()
+
 	err = config.ReadSettings()
 	if err != nil {
 		return nil, err