cursor: move to a hyprland impl

This moves wlr_cursor to a completely new impl mostly under
CPointerManager

Also adds beginSimple to OpenGL for simple render passes (e.g. cursor)

src/render/Renderbuffer.hpp

@@ -13,6 +13,7 @@ class CRenderbuffer {
     void          bindFB();
     void          unbind();
     CFramebuffer* getFB();
+    uint32_t      getFormat();
 
     wlr_buffer*   m_pWlrBuffer = nullptr;
 
@@ -22,4 +23,5 @@ class CRenderbuffer {
     EGLImageKHR  m_iImage = 0;
     GLuint       m_iRBO   = 0;
     CFramebuffer m_sFramebuffer;
+    uint32_t     m_uDrmFormat = 0;
 };