Port current delink progress to USA and EUR Rev 1 (#139)

* sig apply main usa

* sig apply main eur1

* eur1 main

* usa main

* relocs and symbol fixes

* sig apply ov000 eur1

* sig apply ov000 usa

* eur1 ov000

* usa ov000

* fix duplicates

* fix issue with -lang flag

* make usa build OK

* make eur1 build OK

* ninja format

* name all functions from eur names

* eur1 overlay 18 and 19

* usa overlay 18 and 19

* eur1 version differences + fileselect fix

* overlay 17

* various overlays 1

* various overlays 2

* various overlays 3

* add missing last delinks

* various overlays 4

* usa overlay 32

* eur1 overlays 32, 36, 37, 41, 44, 49, 57, 68, 70, 73, 75, 80 and 94

* eur1 overlays 32 (for real this time) and 63

* eur1 overlay 31

* eur1 overlay 24

* add 97, 100 and itcm

* run ninja format

include/FileSelect/FileSelect.hpp

@@ -4,6 +4,7 @@
 #include "FileSelect/FileSelectUnkDraw.hpp"
 #include "Game/GameModeManager.hpp"
 #include "System/SysNew.hpp"
+#include "Unknown/UnkStruct_0204a088.hpp"
 #include "Unknown/UnkSystem1.hpp"
 #include "global.h"
 #include "iterator.hpp"
@@ -12,7 +13,6 @@
 #include <nitro/reg.h>
 
 extern const s16 data_ov019_020d1bb0[];
-extern "C" void func_ov001_020bd6a8();
 
 class FileSelect_UnkClass7_04 {
 public:
@@ -101,7 +101,7 @@ public:
         REG_DISPCNT_SUB |= 0x00200010;
 
         this->mUnk_004.func_ov001_020bd734(data_ov019_020d1bb0);
-        func_ov001_020bd6a8();
+        UnkStruct_0204a088::Create();
     }
     // clang-format on