more OpenGL support, cameras and 3D projection and it now shares 3D models with vulkan, OpenGL does not work if launched, and switching to vulkan from OpenGL does not work

resources/EngineResources/GLShaders/gui_vertex.glsl

@@ -0,0 +1,17 @@
+#version 330
+
+layout (location=0) in vec2 inPos;
+layout (location=1) in vec2 inTextCoords;
+layout (location=2) in vec4 inColour;
+
+out vec2 fragTextCoords;
+out vec4 fragColour;
+
+uniform vec2 scale;
+
+void main()
+{
+    fragTextCoords = inTextCoords;
+    fragColour = inColour;
+    gl_Position = vec4(inPos * scale + vec2(-1.0, 1.0), 0.0, 1.0);
+}