add build scripts

scripts/_app_scaffolds/linux/install.sh

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+#!/bin/bash
+
+echo "Installing ..."
+cd ..
+mkdir {APP_PATH}
+cp -r {APP_NAME} {APP_BASEPATH}
+
+cd {APP_NAME}
+chmod +x {APP_EXEC}
+cp {APP_ICON} {APP_ICON_PATH}
+cp {APP_NAME}.desktop /usr/share/applications/{APP_NAME}.desktop
+
+read -p "Delete original files? (y/n): " answer
+if [[ $answer == "y" ]]; then
+    echo "Deleting ..."
+    cd ..
+    rm -rf {APP_NAME}
+fi
+
+echo "DONE."

scripts/_app_scaffolds/linux/myapp.desktop

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+[Desktop Entry]
+Version=1.0
+Encoding=UTF-8
+Name={APP_NAME}
+Icon={APP_ICON_PATH}
+Exec={APP_EXEC}
+Path={APP_PATH}
+Terminal=false
+Type=Application

scripts/_app_scaffolds/mac/myapp.app/Contents/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+    <!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+    <plist version="1.0">
+    <dict>
+        <key>NSHighResolutionCapable</key>
+        <true/>
+        <key>CFBundleExecutable</key>
+        <string>bootstrap</string>
+        <key>CFBundleGetInfoString</key>
+        <string>{APP_NAME}</string>
+        <key>CFBundleIconFile</key>
+        <string>icon.icns</string>
+        <key>CFBundleIdentifier</key>
+        <string>{APP_ID}</string>
+        <key>CFBundleName</key>
+        <string>{APP_BUNDLE}</string>
+        <key>CFBundleShortVersionString</key>
+        <string>{APP_VERSION}</string> 
+        <key>CFBundleGetInfoString</key>
+        <string>{APP_NAME} {APP_VERSION}</string>
+        <key>CFBundlePackageType</key>
+        <string>APPL</string>
+        <key>LSMinimumSystemVersion</key>
+        <string>{APP_MIN_OS}</string>
+        <key>NSAppTransportSecurity</key>
+        <dict>
+            <key>NSAllowsArbitraryLoads</key>
+            <true/>
+        </dict>
+    </dict>
+    </plist>

scripts/_app_scaffolds/mac/myapp.app/Contents/MacOS/bootstrap

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+#!/usr/bin/env bash
+# Based on code by https://github.com/malipetek - hey you did a brilliant job!
+MACOS="$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
+CONTENTS="$(dirname "$MACOS")"
+exec "${MACOS}/main" --path="${CONTENTS}/Resources" --enable-extensions=true

scripts/_app_scaffolds/win/install-icon.cmd

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+@echo off
+set TOOL="c:\Program Files (x86)\Resource Hacker\ResourceHacker.exe"
+if exist %TOOL% (
+    %TOOL% -open {APP_NAME} -save {APP_NAME} -action addskip -res {APP_ICON} -mask ICONGROUP,MAINICON,
+    del {APP_ICON} 
+    del install-icon.cmd
+)
+else (
+    echo "Please install 'Resource Hacker' first."
+    echo "Press any key ..."
+    pause
+    start "" "https://www.angusj.com/resourcehacker/"
+)