Update Windows icon and NSIS banner (JuliaLang#32054)

(cherry picked from commit a43c46b)

contrib/windows/7zSFX-config.txt

@@ -1,4 +1,4 @@
 ;!@Install@!UTF-8!
-Title="The Julia Language"
+Title="Julia"
 RunProgram="julia-installer.exe"
 ;!@InstallEnd@!

contrib/windows/build-installer.nsi

@@ -7,9 +7,31 @@ OutFile "julia-installer.exe"
 SetCompress off
 CRCCheck on
 SetDataBlockOptimize on
-ShowInstDetails show
+ShowInstDetails nevershow
+ShowUninstDetails nevershow
 RequestExecutionLevel user
-BrandingText "Julia ${Version}"
+BrandingText " "
+
+!define /date YEAR "%Y"
+
+Name "Julia"
+VIProductVersion "10.20.0.0" # arbitrary value since it doesn't mater, but is required; format must be X.X.X.X
+VIAddVersionKey "ProductName" "Julia"
+VIAddVersionKey "CompanyName " "Julia Language"
+VIAddVersionKey "ProductVersion" "${Version}"
+VIAddVersionKey "FileDescription" "Julia Language Installer"
+VIAddVersionKey "Comments" "https://julialang.org/"
+VIAddVersionKey "LegalCopyright" "Copyright (c) 2009-${YEAR} Julia Language"
+VIAddVersionKey "FileVersion" ""
+
+Caption "Julia Installer" # title bar
+
+!define MUI_ICON "${JULIAHOME}\contrib\windows\julia.ico"
+!define MUI_UNICON "${JULIAHOME}\contrib\windows\julia.ico"
+!define MUI_WELCOMEFINISHPAGE_BITMAP "${JULIAHOME}\contrib\windows\julia-banner.bmp"
+!define MUI_HEADERIMAGE
+!define MUI_HEADERIMAGE_BITMAP "${JULIAHOME}\contrib\windows\julia-header.bmp"
+!define MUI_HEADERIMAGE_RIGHT
 
 # Uninstall settings
 !define UninstLog "uninstall.log"
@@ -153,5 +175,3 @@ FunctionEnd
 Function ShowInstallFolder
  ExecShell "open" $INSTDIR
 FunctionEnd
-
-