feat(util): Add func to check if running as admin user

This has been a source of common error in the past.
It is known that most, or even all, games run into
various issues when not run with elevated privileges.

src/main/util/proc.c

@@ -1,7 +1,55 @@
-#include <windows.h>
+#define LOG_MODULE "util-proc"
 
+#include <windows.h>
+#include <winnt.h>
+
+#include <stdbool.h>
 #include <stdint.h>
 
+#include "util/log.h"
+
+bool proc_is_running_as_admin_user()
+{
+    SID_IDENTIFIER_AUTHORITY authority = SECURITY_NT_AUTHORITY;
+    PSID sid;
+    BOOL res;
+    BOOL is_admin;
+
+    res = AllocateAndInitializeSid(
+        &authority,
+        2,
+        SECURITY_BUILTIN_DOMAIN_RID,
+        DOMAIN_ALIAS_RID_ADMINS,
+        0,
+        0,
+        0,
+        0,
+        0,
+        0,
+        &sid);
+
+    if (!res) {
+        log_warning(
+            "Failed to allocate memory for is admin check: %lX",
+            GetLastError());
+        return false;
+    }
+
+    is_admin = false;
+
+    res = CheckTokenMembership(NULL, sid, &is_admin);
+
+    if (!res) {
+        log_warning(
+            "Failed to check admin group membership: %lX", GetLastError());
+        return false;
+    }
+
+    FreeSid(sid);
+
+    return is_admin;
+}
+
 void proc_terminate_current_process(uint32_t exit_code)
 {
     HANDLE hnd;

src/main/util/proc.h

@@ -1,5 +1,8 @@
 #pragma once
 
+#include <stdbool.h>
 #include <stdint.h>
 
+bool proc_is_running_as_admin_user();
+
 void proc_terminate_current_process(uint32_t exit_code);