Reapply "Death to C++"

This reverts commit 13f856cfbc.

src/ui/ui_icons.h

@@ -1,9 +1,9 @@
 #pragma once
-// ui_icons.h - SVG icon definitions and atlas rasterization via lunasvg
+// ui_icons.h - SVG icon definitions and atlas rasterization via nanosvg
 
 #include "base/base_inc.h"
 
-enum UI_IconID {
+typedef enum UI_IconID {
     UI_ICON_CLOSE,
     UI_ICON_CHECK,
     UI_ICON_CHEVRON_DOWN,
@@ -17,12 +17,12 @@ enum UI_IconID {
     UI_ICON_POP_OUT,
     UI_ICON_POP_IN,
     UI_ICON_COUNT
-};
+} UI_IconID;
 
-struct UI_IconInfo {
+typedef struct UI_IconInfo {
     F32 u0, v0, u1, v1;  // UV coordinates in icon atlas
     F32 w, h;             // pixel dimensions at rasterized size
-};
+} UI_IconInfo;
 
 extern UI_IconInfo g_icons[UI_ICON_COUNT];