cfg: use %appdata%\spice2x for new config files (#300)

## Link to GitHub Issue, if one exists
n/a

## Description of change

For JSON config files of the following features:

* patch manager
* screen resize
* IIDX camera hook
* card manager

when saving a new file, store them in %appdata%\spice2x instead of
%appdata%.

On load:
1. If the JSON file exists in %appdata%\spice2x, use that (new path)
1. If the JSON file exists in %appdata%, continue to use that (legacy
path)

It's common for people to have mixed versions of spicetools/spice2x so
we'll continue to read from the %appdata% root if the files are there,
but with a preference for the new path. We will not forcibly move files.

spicetools.xml will continue to live in the %appdata% root. Moving this
will confuse a lot of people, so I'm avoiding this.

Also, this fixes `-patchcfgpath` and `-resizecfgpath` to create
directories as needed (previously the parent directory must have existed
first)

## Testing
Tested -

* existing config files are continued to be read from %appdata%
* new files get created in %appdata%\spice2x\... (both in spicecfg and
in overlay)
* can provide custom path for `-patchcfgpath` `-resizecfgpath` and
observe directories + file created in custom path, try absolute or local
relative paths

src/spice2x/launcher/options.cpp

@@ -1088,7 +1088,7 @@ static const std::vector<OptionDefinition> OPTION_DEFINITIONS = {
         .title = "Screen Resize Config Path",
         .name = "resizecfgpath",
         .desc = "Sets a custom file path for screen resize config file. "
-            "If left empty, %appdata%\\spicetools_screen_resize.json will be used",
+            "If left empty, %appdata%\\spice2x\\spicetools_screen_resize.json will be used",
         .type = OptionType::Text,
         .category = "Paths",
     },
@@ -1097,7 +1097,7 @@ static const std::vector<OptionDefinition> OPTION_DEFINITIONS = {
         .title = "Patch Manager Config Path",
         .name = "patchcfgpath",
         .desc = "Sets a custom file path for patch manager config file. Can be used to manage 'profiles' for auto-patches. "
-            "If left empty, %appdata%\\spicetools_patch_manager.json will be used",
+            "If left empty, %appdata%\\spice2x\\spicetools_patch_manager.json will be used",
         .type = OptionType::Text,
         .category = "Paths",
     },