PlayOnLinux POL_Install_Steam override to use shared Steam installation

POL_Install_steam

#!/bin/bash
# set it so that it points to your steam installation, no / at the end!
# also, because of hardlink usage this must be on the same disc partition as the PlayOnLinux wineprefixes
STEAM_PATH=~/WINEApps/Steam
[ ! -e "$STEAM_PATH/Steam.exe" ] && POL_Debug_Fatal "Steam wasn't found in path $STEAM_PATH, check your STEAM_PATH variable in POL_Install_steam function override"
POL_LoadVar_PROGRAMFILES
# mandatory dependencies, taken from original POL_Install_steam script
POL_Wine_InstallFonts
POL_Call POL_Install_corefonts
POL_Call POL_Function_FontsSmoothRGB
cd "$WINEPREFIX/drive_c/$PROGRAMFILES"
mkdir Steam
# hardlink, so that it can be found by POL_SHORTCUT
ln "$STEAM_PATH/Steam.exe" Steam/Steam.exe
# everything else will be symlink, because hardlinks don't work with directories
ln -s "$STEAM_PATH"/* ./Steam/
# disable dwrite, so that text in steam is visible
cat << EOF > "$POL_USER_ROOT/tmp/steam_dwrite_disable.reg"
[HKEY_CURRENT_USER\\Software\\Valve\\Steam]
"DWriteEnable"=dword:00000000
EOF
regedit "$POL_USER_ROOT/tmp/steam_dwrite_disable.reg"

# dll overrides, taken from original script
POL_Wine_OverrideDLL "" "gameoverlayrenderer"
POL_Wine_OverrideDLL "" "dwrite"

POL_SetupWindow_textbox "Steam shortcut name, blank if you don't want shortcut."
if [ -n "$APP_ANSWER" ]; then
    POL_Shortcut "steam.exe" "$APP_ANSWER"
fi