OTRGlobals cleanup (#4251)

* Remove unused headers

* Move all "ResourceMgr_" functions to a new file

* Don't transitively include SaveManager

* Move cvar prefixes to a new header

* Add missing includes

* Update OTRGlobals.cpp

* Fix build

* Address review

* Fix some of the errors

* Update gameplaystats.h

* Update z_en_in.c

* Hopefully fix the linux issues

* Fix Linux issues for real this time, I checked

* Update ResourceManagerHelpers.cpp

* Update z_obj_mure2.c

* Post-merge fixes

* Fix build (hopefully)

* Post-merge fixes

* Update z_file_nameset_PAL.c

* cleanup some unnecessary headers (#7)

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Co-authored-by: Archez <Archez@users.noreply.github.com>

soh/soh/Enhancements/debugger/debugSaveEditor.cpp

@@ -18,6 +18,7 @@ extern "C" {
 #include "variables.h"
 #include "functions.h"
 #include "macros.h"
+#include "soh/cvar_prefixes.h"
 #include "soh/Enhancements/randomizer/adult_trade_shuffle.h"
 extern PlayState* gPlayState;