revert HTile lifetime changes and opt-in ZMask support

src/common/emulatorConfig.h

@@ -86,7 +86,6 @@ struct ConfigOptions {
 	bool                   renderdoc_enabled           = false;
 	bool                   readback_linear_images      = false;
 	bool                   sync_raw_image_buffers      = false;
-	bool                   support_zmask               = false;
 	bool                   tessellation_enabled        = false;
 	bool                   trophy_enabled              = true;
 	uint32_t               trophy_duration_seconds     = 6;
@@ -152,7 +151,6 @@ bool GpuAssistedValidationEnabled();
 bool RenderDocEnabled();
 bool ReadbackLinearImagesEnabled();
 bool SyncRawImageBuffersEnabled();
-bool SupportZmaskEnabled();
 bool TessellationEnabled();
 bool TrophyEnabled();
 uint32_t GetTrophyDurationSeconds();