most apps now begin in the correct directory

Author: https://github.com/alexispurslane
Commit: 50154a23cb
Pull-request: https://github.com/SerenityOS/serenity/pull/118
Reviewed-by: https://github.com/awesomekling

LibCore/CUserInfo.cpp

@@ -0,0 +1,17 @@
+#include "CUserInfo.h"
+#include <stdlib.h>
+#include <unistd.h>
+#include <pwd.h>
+
+const char *get_current_user_home_path() {
+    if (auto* home_env = getenv("HOME")) {
+        return home_env;
+    } else {
+        auto d = "/";
+        uid_t uid = getuid();
+        if (auto* pwd = getpwuid(uid))
+            return pwd->pw_dir;
+        else
+            return d;
+    }
+}