deps/obs-scripting: Add scripting support

Allows Lua/Python scripting support.

deps/obs-scripting/cstrcache.cpp

@@ -0,0 +1,28 @@
+#include <unordered_map>
+#include <string>
+
+#include "cstrcache.h"
+
+using namespace std;
+
+struct const_string_table {
+	unordered_map<string, string> strings;
+};
+
+static struct const_string_table table;
+
+const char *cstrcache_get(const char *str)
+{
+	if (!str || !*str)
+		return "";
+
+	auto &strings = table.strings;
+	auto pair = strings.find(str);
+
+	if (pair == strings.end()) {
+		strings[str] = str;
+		pair = strings.find(str);
+	}
+
+	return pair->second.c_str();
+}