update the default save location

[willbr]

I think we should change the default save location to Documents.

Currently, it defaults to creating a user folder under C\Program Files\. However, this isn't allowed in modern windows.

Window's creates a VirtualStore to be backwards compatible, but it's hidden from the user.

C:\Users\wjbr\AppData\Local\VirtualStore\Program Files (x86)\Microsoft Kids\USERS\wjbr

Here's where it sets up the folders.

3DMMForever/src/studio/utest.cpp

Lines 1152 to 1157 in 79b3010

	/******************************************************************************
	Finds _fniUsersDir, _fniMelanieDir, and _fniUserDir. _fniUserDir is
	set from the registry. This function also determines if this is a first
	time user.
	************************************************************ PETED ***********/
	bool APP::_FGetUserDirectories(void)

We can use SHGetFolderPath or SHGetKnownFolderPath to get the path of the Documents folder.

 HRESULT result = SHGetFolderPath(NULL, CSIDL_PERSONAL, NULL, SHGFP_TYPE_CURRENT, myDocuments);

https://learn.microsoft.com/en-us/windows/win32/api/shlobj_core/nf-shlobj_core-shgetfolderpatha
https://learn.microsoft.com/en-us/windows/win32/api/shlobj_core/nf-shlobj_core-shgetknownfolderpath