[client] egl: replace monolithic EGLTexture with modular version

The way things were handled in EGLTexture is not only very hard to
follow, but broken. This change set breaks up EGLTexture into a modular
design making it easier to implement the various versions.

Note that DMABUF is currently broken and needs to be re-implemented.

client/renderers/EGL/CMakeLists.txt

@@ -36,7 +36,11 @@ add_library(renderer_EGL STATIC
 	egl.c
 	egldebug.c
 	shader.c
+	texture_util.c
 	texture.c
+	texture_buffer.c
+	texture_framebuffer.c
+	texture_dmabuf.c
 	model.c
 	desktop.c
 	cursor.c