Add API for accessing command-line arguments.

- Add process module with Process class.
- Add "arguments" and "allArguments" methods.
- Docs for same.
- Support passing additional arguments to command line.
- Add "--help" support to command line.

src/module/process.c

@@ -0,0 +1,23 @@
+#include "process.h"
+#include "wren.h"
+
+int numArgs;
+const char** args;
+
+void processSetArguments(int argc, const char* argv[])
+{
+  numArgs = argc;
+  args = argv;
+}
+
+void processAllArguments(WrenVM* vm)
+{
+  wrenEnsureSlots(vm, 2);
+  wrenSetSlotNewList(vm, 0);
+
+  for (int i = 0; i < numArgs; i++)
+  {
+    wrenSetSlotString(vm, 1, args[i]);
+    wrenInsertInList(vm, 0, -1, 1);
+  }
+}

src/module/process.h

@@ -0,0 +1,9 @@
+#ifndef process_h
+#define process_h
+
+#include "wren.h"
+
+// Stores the command line arguments passed to the CLI.
+void processSetArguments(int argc, const char* argv[]);
+
+#endif

src/module/process.wren

@@ -0,0 +1,6 @@
+class Process {
+  // TODO: This will need to be smarter when wren supports CLI options.
+  static arguments { allArguments[2..-1] }
+
+  foreign static allArguments
+}

src/module/process.wren.inc

@@ -0,0 +1,7 @@
+// Generated automatically from src/module/process.wren. Do not edit.
+static const char* processModuleSource =
+"class Process {\n"
+"  static arguments { allArguments[2..-1] }\n"
+"\n"
+"  foreign static allArguments\n"
+"}\n";