[client] redesign of the renderer archiceture for mt support

This is the first of two commits that completely turn the rendering code
on it's head. This change set decouples the guest's capture rate from
the host's render rate for both cursor and frame updates. This helps
prevent the host application from stalling when waiting for frame draws
when all it want's to do is send cursor updates.

* Breaks OpenGL-Basic for now

common/KVMFR.h

@@ -21,7 +21,7 @@ Place, Suite 330, Boston, MA 02111-1307 USA
 #include <stdint.h>
 
 #define KVMFR_HEADER_MAGIC   "[[KVMFR]]"
-#define KVMFR_HEADER_VERSION 4
+#define KVMFR_HEADER_VERSION 5
 
 typedef enum FrameType
 {
@@ -48,7 +48,13 @@ typedef struct KVMFRCursor
 {
   uint8_t    flags;       // KVMFR_CURSOR_FLAGS
   int16_t    x, y;        // cursor x & y position
+
+  uint32_t   version;     // shape version
   CursorType type;        // shape buffer data type
+  uint32_t   width;       // shape width
+  uint32_t   height;      // shape height
+  uint32_t   pitch;       // shape row pitch  (stride in bytes)
+  uint64_t   dataPos;     // offset to the shape data
 }
 KVMFRCursor;
 
@@ -79,8 +85,7 @@ typedef struct KVMFRHeader
 {
   char        magic[sizeof(KVMFR_HEADER_MAGIC)];
   uint32_t    version;     // version of this structure
-  uint32_t    updateCount; // updated each change
   uint8_t     flags;       // KVMFR_HEADER_FLAGS
   KVMFRDetail detail;      // details
 }
-KVMFRHeader;
+KVMFRHeader;