Some code cleanup, port of StateLoader to C, some statesaver + rewind fixes.

zsnes/src/gui/gui.asm

@@ -3134,7 +3134,9 @@ MoviePlay:
     call SRAMChdir
     popad
     mov dword[Totalbyteloaded],0
+    pushad
     call loadstate2
+    popad
     mov edx,fnamest+1
     call Open_File
     jc near .notexist
@@ -3687,7 +3689,9 @@ GUIProcStates:
     call NetLoadStuff
     jmp .changedir
 .notnet
+    pushad
     call loadstate2
+    popad
 .changedir
     ; change dir to LoadDrive/LoadDir
     call ChangetoLOADdir
@@ -3715,9 +3719,9 @@ LoadSecondState:
     mov ebx,[statefileloc]
     mov al,[fnamest+ebx]
     mov byte[fnamest+ebx],'s'
-    push eax
+    pushad
     call loadstate2
-    pop eax
+    popad
     mov ebx,[statefileloc]
     mov [fnamest+ebx],al
     call ChangetoLOADdir

zsnes/src/gui/guimisc.inc

@@ -515,7 +515,9 @@ NEWSYM GUIDoReset
 
     ; reset the snes
     call init65816
+    pushad
     call procexecloop
+    popad
 
     mov eax,spcRam
     mov edx,0EFh

zsnes/src/gui/guinetpl.inc

@@ -1630,7 +1630,7 @@ NetStateTotal resd 1
 NetStateQuit resb 1
 NetStateBuffer resb 2048
 SECTION .data
-Netfname db 'nettemp.zst',0
+NEWSYM Netfname, db 'nettemp.zst',0
 SECTION .text
 
 NetLoadStuff:
@@ -1756,7 +1756,9 @@ loadstatesend:
     cmp dword[NetStateSize],0
     jne .notzero
     pushad
+    pushad
     call loadstate2
+    popad
     mov byte[RestoreValues],0
     mov bx,[NetLoadHandle]
     call Close_File
@@ -1834,7 +1836,9 @@ loadstaterecv:
     popad
     mov edx,Netfname
     mov byte[RestoreValues],0
+    pushad
     call loadstate3
+    popad
     call ChangetoLOADdir
     cmp byte[NetLoadState],0
     je .norun2