SDK improvements (#352)

TactilityC additions for:
- C randomization functions
- Tactility app paths
- Tactility locks

TactilityC/Source/tt_file.cpp

@@ -0,0 +1,13 @@
+#include <tt_file.h>
+#include <tt_lock_private.h>
+#include <Tactility/file/FileLock.h>
+
+extern "C" {
+
+LockHandle tt_lock_alloc_for_file(const char* path) {
+    auto lock = tt::file::getLock(path);
+    auto holder = new LockHolder(lock);
+    return holder;
+}
+
+}