Modernize Thread

- Based on C++11's `thread` and `thread_local`
- No more need to allocate-deallocate or check for null
- No pointer anymore, just a member variable
- Platform-specific implementations no longer needed (except for the few cases of non-portable functions)
- Simpler for `NO_THREADS`
- Thread ids are now the same across platforms (main is 1; others follow)

1 files changed, 3 insertions, 4 deletions

diff --git a/platform/android/export/export.cpp b/platform/android/export/export.cpp
index 62720e8249..a963c5a741 100644
--- a/platform/android/export/export.cpp
+++ b/platform/android/export/export.cpp
@@ -269,7 +269,7 @@ class EditorExportPlatformAndroid : public EditorExportPlatform {
 	Vector<Device> devices;
 	volatile bool devices_changed;
 	Mutex device_lock;
-	Thread *check_for_changes_thread;
+	Thread check_for_changes_thread;
 	volatile bool quit_request;
 
 	static void _check_for_changes_poll_thread(void *ud) {
@@ -2848,13 +2848,12 @@ public:
 		devices_changed = true;
 		plugins_changed = true;
 		quit_request = false;
-		check_for_changes_thread = Thread::create(_check_for_changes_poll_thread, this);
+		check_for_changes_thread.start(_check_for_changes_poll_thread, this);
 	}
 
 	~EditorExportPlatformAndroid() {
 		quit_request = true;
-		Thread::wait_to_finish(check_for_changes_thread);
-		memdelete(check_for_changes_thread);
+		check_for_changes_thread.wait_to_finish();
 	}
 };