libobs: Add shared interface libraries to shared project directory

The ComPtr, WinHandle, and obfuscate source files are shared with
multiple sub-projects and thus need to be moved into the shared
directory to uncouple their availability from libobs itself.

The same applies to d3d8-api, inject-library, and hook-config
(from win-capture), as well as comutils (from the virtualcam-module).

shared/obs-shared-memory-queue/shared-memory-queue.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct video_queue;
+struct nv12_scale;
+typedef struct video_queue video_queue_t;
+typedef struct nv12_scale nv12_scale_t;
+
+enum queue_state {
+	SHARED_QUEUE_STATE_INVALID,
+	SHARED_QUEUE_STATE_STARTING,
+	SHARED_QUEUE_STATE_READY,
+	SHARED_QUEUE_STATE_STOPPING,
+};
+
+extern video_queue_t *video_queue_create(uint32_t cx, uint32_t cy,
+					 uint64_t interval);
+extern video_queue_t *video_queue_open();
+extern void video_queue_close(video_queue_t *vq);
+
+extern void video_queue_get_info(video_queue_t *vq, uint32_t *cx, uint32_t *cy,
+				 uint64_t *interval);
+extern void video_queue_write(video_queue_t *vq, uint8_t **data,
+			      uint32_t *linesize, uint64_t timestamp);
+extern enum queue_state video_queue_state(video_queue_t *vq);
+extern bool video_queue_read(video_queue_t *vq, nv12_scale_t *scale, void *dst,
+			     uint64_t *ts);
+
+#ifdef __cplusplus
+}
+#endif