[UI] Redesigned "Install Content" window

- Added ID for each ImGui window
- Added filesystem::CreateFolder function

src/xenia/base/filesystem.cc

@@ -24,6 +24,19 @@ bool CreateParentFolder(const std::filesystem::path& path) {
   return true;
 }
 
+std::error_code CreateFolder(const std::filesystem::path& path) {
+  if (std::filesystem::exists(path)) {
+    return {};
+  }
+
+  std::error_code ec;
+  if (std::filesystem::create_directories(path, ec)) {
+    return {};
+  }
+
+  return ec;
+}
+
 std::vector<FileInfo> ListDirectories(const std::filesystem::path& path) {
   std::vector<FileInfo> files = ListFiles(path);
   std::vector<FileInfo> directories = {};

src/xenia/base/filesystem.h

@@ -45,6 +45,10 @@ std::filesystem::path GetUserFolder();
 // attempting to create it.
 bool CreateParentFolder(const std::filesystem::path& path);
 
+// Creates folder on specified path.
+// If folder already exists it returns success (no error).
+std::error_code CreateFolder(const std::filesystem::path& path);
+
 // Creates an empty file at the given path, overwriting if it exists.
 bool CreateEmptyFile(const std::filesystem::path& path);