Move all old deployment stuff to a new folder

deployment/old/windows/helpers/ShowError.nsh

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+; Show error
+!macro ShowError TEXT RETRYLABEL
+  MessageBox MB_ABORTRETRYIGNORE|MB_ICONSTOP "${TEXT}" IDIGNORE +2 IDRETRY ${RETRYLABEL}
+  Abort
+!macroend
+
+!macro ShowErrorFinal TEXT
+  MessageBox MB_OK|MB_ICONSTOP "${TEXT}"
+  Abort
+!macroend

deployment/old/windows/helpers/StrSlash.nsh

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+; Adapted from: https://nsis.sourceforge.io/Another_String_Replace_(and_Slash/BackSlash_Converter) (2019-08-31)
+
+!macro _StrSlashConstructor out in
+  Push "${in}"
+  Push "\"
+  Call StrSlash
+  Pop ${out}
+!macroend
+
+!define StrSlash '!insertmacro "_StrSlashConstructor"'
+
+; Push $filenamestring (e.g. 'c:\this\and\that\filename.htm')
+; Push "\"
+; Call StrSlash
+; Pop $R0
+; ;Now $R0 contains 'c:/this/and/that/filename.htm'
+Function StrSlash
+  Exch $R3 ; $R3 = needle ("\" or "/")
+  Exch
+  Exch $R1 ; $R1 = String to replacement in (haystack)
+  Push $R2 ; Replaced haystack
+  Push $R4 ; $R4 = not $R3 ("/" or "\")
+  Push $R6
+  Push $R7 ; Scratch reg
+  StrCpy $R2 ""
+  StrLen $R6 $R1
+  StrCpy $R4 "\"
+  StrCmp $R3 "/" loop
+  StrCpy $R4 "/"
+loop:
+  StrCpy $R7 $R1 1
+  StrCpy $R1 $R1 $R6 1
+  StrCmp $R7 $R3 found
+  StrCpy $R2 "$R2$R7"
+  StrCmp $R1 "" done loop
+found:
+  StrCpy $R2 "$R2$R4"
+  StrCmp $R1 "" done loop
+done:
+  StrCpy $R3 $R2
+  Pop $R7
+  Pop $R6
+  Pop $R4
+  Pop $R2
+  Pop $R1
+  Exch $R3
+FunctionEnd