overlay: helper modal dialog for picking option values (#561)

## Link to GitHub Issue or related Pull Request, if one exists

## Description of change
Introduce a new modal dialog for picking out some of the options to
improve UX.

Implemented a few for now:

1. UI for picking ASIO drivers from a list (for -iidxasio, -sdvxasio,
-asioconvert, etc)
2. Button to generate card numbers for -card0 and card1
3. Processor Affinity selector (very similar to what's in Windows Task
Manager, list of checkboxes)
4. file selector (file open dialog for various file path overrides like
log file)
5. folder selector (folder override)

I wrote a selector for COM ports as well but how we use the value was
inconsistent (\\\\.\\COMx vs. COMx) and didn't see a huge point in it so
I didn't check it in.

## Testing

src/spice2x/overlay/windows/config.h

@@ -76,6 +76,10 @@ namespace overlay::windows {
         std::string search_filter = "";
         std::string search_filter_in_lower_case = "";
 
+        std::filesystem::path file_picker_path;
+        std::thread *file_picker_thread = nullptr;
+        bool file_picker_done = false;
+
         void build_buttons(const std::string &name, std::vector<Button> *buttons, int min = 0, int max = -1);
         void build_button(
             const std::string &name,
@@ -104,6 +108,8 @@ namespace overlay::windows {
         void edit_light_popup(Light &primary_light, Light *light, const int alt_index);
 
         void build_cards();
+        std::string build_option_value_picker_title(const OptionDefinition& option);
+        void build_option_value_picker(Option& option);
         void build_options(
             std::vector<Option> *options, const std::string &category, const std::string *filter=nullptr);
         void build_about();