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/testing/tester/tester.c

@@ -8,23 +8,23 @@
 #include <stdio.h>
 #include <stdlib.h>
 
-wapp_intern void handle_test_result(TestFuncResult result);
+wp_intern void handleTestResult(WpTestFuncResult result);
 
-void run_tests(TestFunc *func1, ...) {
+void _runTests(WpTestFunc *func1, ...) {
 	printf("\n");
 
-	handle_test_result(func1());
+	handleTestResult(func1());
 
 	va_list args;
 	va_start(args, func1);
 
-	TestFunc *func = va_arg(args, TestFunc *);
+	WpTestFunc *func = va_arg(args, WpTestFunc *);
 
 	while (func) {
-		TestFuncResult result = func();
-		handle_test_result(result);
+		WpTestFuncResult result = func();
+		handleTestResult(result);
 
-		func = va_arg(args, TestFunc *);
+		func = va_arg(args, WpTestFunc *);
 	}
 
 	va_end(args);
@@ -32,22 +32,22 @@ void run_tests(TestFunc *func1, ...) {
 	printf("\n");
 }
 
-wapp_intern void handle_test_result(TestFuncResult result) {
-	TerminalColour colour;
-	Str8 result_text = wapp_str8_buf(64);
+wp_intern void handleTestResult(WpTestFuncResult result) {
+	WpTerminalColour colour;
+	WpStr8 result_text = wpStr8Buf(64);
 
 	if (result.passed) {
-		colour = WAPP_TERM_COLOUR_FG_BR_GREEN;
-		wapp_str8_copy_cstr_capped(&result_text, "PASSED");
+		colour = WP_TERM_COLOUR_FG_BR_GREEN;
+		wpStr8CopyCstrCapped(&result_text, "PASSED");
 	} else {
-		colour = WAPP_TERM_COLOUR_FG_BR_RED;
-		wapp_str8_copy_cstr_capped(&result_text, "FAILED");
+		colour = WP_TERM_COLOUR_FG_BR_RED;
+		wpStr8CopyCstrCapped(&result_text, "FAILED");
 	}
 
 	printf("[");
-	wapp_shell_termcolour_print_text(&result_text, colour);
-	wapp_shell_termcolour_clear_colour();
-	printf("] " WAPP_STR8_SPEC "\n", wapp_str8_varg(result.name));
+	wpShellTermcolourPrintText(&result_text, colour);
+	wpShellTermcolourClearColour();
+	printf("] " WP_STR8_SPEC "\n", wpStr8Varg(result.name));
 
 	if (!result.passed) {
 		exit(EXIT_FAILURE);