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/uuid/uuid.c

@@ -15,11 +15,11 @@ struct UUID4 {
 	u64 low;
 };
 
-wapp_intern UUID4 generate_uuid4(void);
-wapp_intern void  uuid4_to_uuid(const UUID4* uuid4, WUUID *uuid);
+wp_intern UUID4 generate_uuid4(void);
+wp_intern void  uuid4_to_uuid(const UUID4* uuid4, WpUuid *uuid);
 
-WUUID *wapp_uuid_init_uuid4(WUUID *uuid) {
-	wapp_debug_assert(uuid != NULL, "`uuid` should not be NULL");
+WpUuid *wpUuidInitUuid4(WpUuid *uuid) {
+	wpDebugAssert(uuid != NULL, "`uuid` should not be NULL");
 
 	UUID4 uuid4 = generate_uuid4();
 	uuid4_to_uuid(&uuid4, uuid);
@@ -27,18 +27,18 @@ WUUID *wapp_uuid_init_uuid4(WUUID *uuid) {
 	return uuid;
 }
 
-wapp_intern UUID4 generate_uuid4(void) {
-	wapp_persist XOR256State state = {0};
-	wapp_persist b8 initialised = false;
+wp_intern UUID4 generate_uuid4(void) {
+	wp_persist WpXor256State state = {0};
+	wp_persist b8 initialised = false;
 
 	if (!initialised) {
 		initialised = true;
-		state       = wapp_prng_xorshift_init_state();
+		state       = wpPrngXorshiftInit();
 	}
 
 	UUID4 uuid = (UUID4){
-		.high  = wapp_prng_xorshift_256(&state),
-		.low  = wapp_prng_xorshift_256(&state),
+		.high  = wpPrngXorshift256(&state),
+		.low  = wpPrngXorshift256(&state),
 	};
 
 	uuid.high = (uuid.high  & 0xffffffffffff0fff) | 0x0000000000004000;
@@ -47,12 +47,12 @@ wapp_intern UUID4 generate_uuid4(void) {
 	return uuid;
 }
 
-wapp_intern void uuid4_to_uuid(const UUID4* uuid4, WUUID *uuid) {
+wp_intern void uuid4_to_uuid(const UUID4* uuid4, WpUuid *uuid) {
 	u64 group1 = uuid4->high >> 32;
 	u64 group2 = (uuid4->high << 32) >> 48;
 	u64 group3 = (uuid4->high << 48) >> 48;
 	u64 group4 = uuid4->low >> 48;
 	u64 group5 = (uuid4->low << 16) >> 16;
 
-	wapp_str8_format(&(uuid->uuid), UUID_STR_FORMAT, group1, group2, group3, group4, group5);
+	wpStr8Format(&(uuid->uuid), UUID_STR_FORMAT, group1, group2, group3, group4, group5);
 }