Renderer: rewrite render scheduling (#8683)

This rewrites renderer scheduling. Occlusion is now unified in a new Pass type.

src/render/pass/ClearPassElement.cpp

@@ -0,0 +1,26 @@
+#include "ClearPassElement.hpp"
+#include "../OpenGL.hpp"
+
+CClearPassElement::CClearPassElement(const CClearPassElement::SClearData& data_) : data(data_) {
+    ;
+}
+
+void CClearPassElement::draw(const CRegion& damage) {
+    g_pHyprOpenGL->clear(data.color);
+}
+
+bool CClearPassElement::needsLiveBlur() {
+    return false;
+}
+
+bool CClearPassElement::needsPrecomputeBlur() {
+    return false;
+}
+
+std::optional<CBox> CClearPassElement::boundingBox() {
+    return CBox{{}, {INT16_MAX, INT16_MAX}};
+}
+
+CRegion CClearPassElement::opaqueRegion() {
+    return *boundingBox();
+}