Unify struct names and tags

src/os/allocators/arena/mem_arena.c

@@ -17,7 +17,7 @@
 
 #define ARENA_MINIMUM_CAPACITY KiB(16) // Allocate minimum of 4 pages
 
-struct arena {
+struct Arena {
 	u8 *buf;
 	u8 *offset;
 	u64 capacity;

src/os/allocators/arena/mem_arena.h

@@ -11,7 +11,7 @@
 BEGIN_C_LINKAGE
 #endif // !WAPP_PLATFORM_CPP
 
-typedef struct arena Arena;
+typedef struct Arena Arena;
 
 #define wapp_mem_arena_init(arena_dptr, base_capacity)                                                           \
 	(wapp_mem_arena_init_custom(arena_dptr, base_capacity, WAPP_MEM_ALLOC_RESERVE, false))

src/os/shell/commander/commander_output.h

@@ -25,8 +25,8 @@ typedef enum {
 	SHELL_ERR_PROC_EXIT_FAIL,
 } CMDError;
 
-typedef struct commander_result CMDResult;
-struct commander_result {
+typedef struct CMDResult CMDResult;
+struct CMDResult {
 	i32 exit_code;
 	CMDError error;
 	b8 exited;

src/os/shell/termcolour/win/termcolour_win.c

@@ -13,8 +13,8 @@
 #define WIN32_LEAN_AND_MEAN
 #include <Windows.h>
 
-typedef struct termcolour_data TermcolourData;
-struct termcolour_data {
+typedef struct TermcolourData TermcolourData;
+struct TermcolourData {
 	HANDLE handle;
 	WORD   default_colour;
 	WORD   current_colour;