Path code cleanup, move some UI code (#21037)

* Move a bunch of path logic into Core/Util/PathUtil.cpp/h

.

* Move GameImageView out from SaveDataScreen

* More cleanup, add a translation string

UI/RemoteISOScreen.cpp

@@ -257,7 +257,6 @@ static bool LoadGameList(const Path &url, std::vector<Path> &games) {
 	browser.SetPath(url);
 	std::vector<File::FileInfo> files;
 	browser.SetUserAgent(StringFromFormat("PPSSPP/%s", PPSSPP_GIT_VERSION));
-	browser.SetRootAlias("ms:", GetSysDirectory(DIRECTORY_MEMSTICK_ROOT));
 	browser.GetListing(files, "iso:cso:chd:pbp:elf:prx:ppdmp:", &scanCancelled);
 	if (scanCancelled) {
 		return false;