Initial public source release

Split reusable rendering and format support into vectorail-core and vectorail-gc.

apps/desktop/shaders/route.vert

@@ -0,0 +1,13 @@
+#version 450 core
+layout (location = 0) in vec3 aPos;
+layout (location = 1) in vec4 aColor;
+
+uniform mat4 uProjection;
+uniform mat4 uView;
+
+out vec4 vColor;
+
+void main() {
+    vColor = aColor;
+    gl_Position = uProjection * uView * vec4(aPos, 1.0);
+}