GUI: Box drawing

assets/shaders/gui_text.vert

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+#version 460
+#extension GL_EXT_nonuniform_qualifier : require
+#extension GL_EXT_scalar_block_layout : require
+#extension GL_EXT_shader_16bit_storage : require
+
+layout(location = 0) in vec4 positionOS_normalOS;
+layout(location = 1) in vec4 texCoordEM_band_flags;
+layout(location = 2) in vec4 jacobian;
+layout(location = 3) in vec4 scale_offset;
+layout(location = 4) in vec4 color;