Add new plugin runtime function

cmd/micro/micro.go

@@ -326,6 +326,7 @@ func main() {
 	L.SetGlobal("ReadRuntimeFile", luar.New(L, PluginReadRuntimeFile))
 	L.SetGlobal("ListRuntimeFiles", luar.New(L, PluginListRuntimeFiles))
 	L.SetGlobal("AddRuntimeFile", luar.New(L, PluginAddRuntimeFile))
+	L.SetGlobal("AddRuntimeFilesFromDirectory", luar.New(L, PluginAddRuntimeFilesFromDirectory))
 
 	jobs = make(chan JobFunction, 100)
 	events = make(chan tcell.Event, 100)

runtime/help/plugins.md

@@ -127,6 +127,9 @@ called `test`, you would create the `test.md` file for example, and runt the fun
 AddRuntimeFile("test", "help", "test.md")
 ```
 
+Use `AddRuntimeFilesFromDirectory(name, type, dir, pattern)` to add a number of files
+to the runtime.
+
 # Autocomplete command arguments
 
 See this example to learn how to use `MakeCompletion` and `MakeCommand`