Moved a bunch of code around

src/duskgl/display/CMakeLists.txt

@@ -0,0 +1,14 @@
+# Copyright (c) 2026 Dominic Masters
+# 
+# This software is released under the MIT License.
+# https://opensource.org/licenses/MIT
+
+# Sources
+target_sources(${DUSK_LIBRARY_TARGET_NAME}
+  PUBLIC
+    displaygl.c
+)
+
+# Subdirs
+add_subdirectory(framebuffer)
+add_subdirectory(texture)