A lot of work

* moved all ugui code to lib/ugui.c3l and made it a library/module
* started work on a sdl3 renderer, with shaders etc
* added the new sdl3.c3l library as a dependency
* makefile is for the renderer

resources/shaders/source/rect.vert.glsl

@@ -0,0 +1,25 @@
+#version 450
+
+layout(set = 1, binding = 0) uniform Viewport {
+	ivec2 view;
+	ivec2 off;
+};
+
+layout(location = 0) in vec2 position;
+layout(location = 1) in vec2 uv;
+layout(location = 2) in ivec4 color;
+
+layout(location = 0) out vec4 col;
+
+void main()
+{
+	//vec2 shift = vec2(0);
+	vec2 shift;
+	shift.x = float(off.x) / view.x;
+	shift.y = -(float(off.y) / view.y);
+
+	vec2 pos = position + shift;
+
+	gl_Position = vec4(pos.x, pos.y, 0.0, 1.0);
+	col = vec4(color) / 255.0;
+}