Standardize naming conventions (#12)

## Summary

Standardize naming conventions across the entire wizapp-stdlib codebase by replacing inconsistent prefixes and snake_case with a unified `wp` prefix + CamelCase scheme.

## Changes

### Naming convention applied

| Pattern | Before | After |
|---|---|---|
| Public functions | `wapp_module_function` | `wpModuleFunction` |
| Public types | `GenericXxx`, bare `Xxx` | `WpXxx` |
| Constants / enum values | `WAPP_XXX`, `SHELL_XXX` | `WP_XXX`, `WP_SHELL_XXX` |
| Internal functions | `_module_function` | `_moduleFunction` |
| Storage-class macros | `wapp_extern`, `wapp_intern` | `wp_extern`, `wp_intern` |

### Modules affected

All 20 modules were renamed: `arena`, `array`, `dbl_list`, `queue`, `str8`, `mem_allocator`, `mem_utils`, `mem_os`, `file`, `cpath`, `log`, `shell_commander`, `shell_termcolour`, `shell_utils`, `prng/xorshift`, `uuid`, `tester`, `aliases`, `assert`, `misc_utils`, `platform` — plus their test files.

### Backward compatibility

Added `src/oldnames.h` with `#define OLD_NAME NEW_NAME` for every renamed symbol, organized by module under Constants → Types → Functions sections. Existing code that includes this file will compile without changes.

Reviewed-on: #12
Co-authored-by: Abdelrahman <said.abdelrahman89@gmail.com>
Co-committed-by: Abdelrahman <said.abdelrahman89@gmail.com>

src/os/mem/posix/mem_os_posix.h

@@ -5,31 +5,31 @@
 
 #include "../../../common/platform/platform.h"
 
-#ifdef WAPP_PLATFORM_CPP
+#ifdef WP_PLATFORM_CPP
 BEGIN_C_LINKAGE
-#endif // !WAPP_PLATFORM_CPP
+#endif // !WP_PLATFORM_CPP
 
-#ifdef WAPP_PLATFORM_POSIX
+#ifdef WP_PLATFORM_POSIX
 
 #include <sys/mman.h>
 
-typedef enum mem_alloc_flags {
-#if defined(WAPP_PLATFORM_LINUX) || defined(WAPP_PLATFORM_GNU)
-	WAPP_MEM_ALLOC_RESERVE = 0,
-	WAPP_MEM_ALLOC_COMMIT  = MAP_POPULATE,
-#elif defined(WAPP_PLATFORM_FREE_BSD)
-	WAPP_MEM_ALLOC_RESERVE = 0,
-	WAPP_MEM_ALLOC_COMMIT  = MAP_PREFAULT_READ,
-#elif defined(WAPP_PLATFORM_BSD) || defined(WAPP_PLATFORM_UNIX) || defined(WAPP_PLATFORM_APPLE)
-	WAPP_MEM_ALLOC_RESERVE = 0,
-	WAPP_MEM_ALLOC_COMMIT  = 0,
+typedef enum {
+#if defined(WP_PLATFORM_LINUX) || defined(WP_PLATFORM_GNU)
+	WP_MEM_ALLOC_RESERVE = 0,
+	WP_MEM_ALLOC_COMMIT  = MAP_POPULATE,
+#elif defined(WP_PLATFORM_FREE_BSD)
+	WP_MEM_ALLOC_RESERVE = 0,
+	WP_MEM_ALLOC_COMMIT  = MAP_PREFAULT_READ,
+#elif defined(WP_PLATFORM_BSD) || defined(WP_PLATFORM_UNIX) || defined(WP_PLATFORM_APPLE)
+	WP_MEM_ALLOC_RESERVE = 0,
+	WP_MEM_ALLOC_COMMIT  = 0,
 #endif
-} MemAllocFlags;
+} WpMemAllocFlags;
 
-#endif // !WAPP_PLATFORM_POSIX
+#endif // !WP_PLATFORM_POSIX
 
-#ifdef WAPP_PLATFORM_CPP
+#ifdef WP_PLATFORM_CPP
 END_C_LINKAGE
-#endif // !WAPP_PLATFORM_CPP
+#endif // !WP_PLATFORM_CPP
 
 #endif // !MEM_OS_POSIX_H