revert to vanilla assets

public/assets/minecraft/shaders/core/gui.vsh

@@ -0,0 +1,24 @@
+#version 330
+
+// Can't moj_import in things used during startup, when resource packs don't exist.
+// This is a copy of dynamicimports.glsl and projection.glsl
+layout(std140) uniform DynamicTransforms {
+    mat4 ModelViewMat;
+    vec4 ColorModulator;
+    vec3 ModelOffset;
+    mat4 TextureMat;
+};
+layout(std140) uniform Projection {
+    mat4 ProjMat;
+};
+
+in vec3 Position;
+in vec4 Color;
+
+out vec4 vertexColor;
+
+void main() {
+    gl_Position = ProjMat * ModelViewMat * vec4(Position, 1.0);
+
+    vertexColor = Color;
+}