More newlines for improved readability (#1880)

* Add blank lines above all `fn`, `impl`, `struct`, etc
* Even newlines between docstringed struct and enum fields
* Improve some documentation

egui_glow/src/painter.rs

@@ -25,6 +25,7 @@ pub type TextureFilter = egui::TextureFilter;
 trait TextureFilterExt {
     fn glow_code(&self) -> u32;
 }
+
 impl TextureFilterExt for TextureFilter {
     fn glow_code(&self) -> u32 {
         match self {

egui_glow/src/shader_version.rs

@@ -60,6 +60,7 @@ impl ShaderVersion {
             Self::Es300 => "#version 300 es\n",
         }
     }
+
     pub(crate) fn is_new_shader_interface(&self) -> &'static str {
         match self {
             ShaderVersion::Es300 | ShaderVersion::Gl140 => "#define NEW_SHADER_INTERFACE\n",