Implemented Windows registry read/write (#225)

* Implemented Windows registry read/write

* Simplify registry API and handle path writes

* Linux SetWorkingDirectory

* Implement reading path and unicode string from windows registry

* Use string_view value names for registry

* Use RegGetValueW

* Paths adjustments

* /

* Update working directory update failure message

* Updated linux SetWorkingDirectory

* Update flatpak define

* Remove RootDirectoryPath and save registry at startup

* dont save registry on exit

* Slight formatting update

---------

Co-authored-by: Sajid <sajidur78@gmail.com>

UnleashedRecomp/main.cpp

@@ -12,9 +12,12 @@
 #include <hid/hid.h>
 #include <user/config.h>
 #include <user/paths.h>
+#include <user/registry.h>
 #include <kernel/xdbf.h>
 #include <install/installer.h>
 #include <os/logger.h>
+#include <os/process.h>
+#include <os/registry.h>
 #include <ui/installer_wizard.h>
 #include <mod/mod_loader.h>
 
@@ -144,6 +147,9 @@ int main(int argc, char *argv[])
     timeBeginPeriod(1);
 #endif
 
+    if (!os::registry::Init())
+        LOGN_WARNING("OS doesn't support registry");
+
     os::logger::Init();
 
     bool forceInstaller = false;