refactor: Use stable Node-API instead of nan

the Node-API is binary stable and compatible between node 10+ and
electron 3+.

binding.gyp

@@ -1,21 +1,23 @@
 {
   'targets': [{
     'target_name': 'robotjs',
+      'cflags!': [ '-fno-exceptions' ],
+      'cflags_cc!': [ '-fno-exceptions' ],
+      'xcode_settings': { 'GCC_ENABLE_CPP_EXCEPTIONS': 'YES',
+        'CLANG_CXX_LIBRARY': 'libc++',
+        'MACOSX_DEPLOYMENT_TARGET': '10.7',
+      },
+      'msvs_settings': {
+        'VCCLCompilerTool': { 'ExceptionHandling': 1 },
+      },
     'include_dirs': [
-        "<!(node -e \"require('nan')\")"
-    ],
-
-    'cflags': [
-      '-Wall',
-      '-Wparentheses',
-      '-Winline',
-      '-Wbad-function-cast',
-      '-Wdisabled-optimization'
+      '<!(node -p "require(\'node-addon-api\').include_dir")',
     ],
 
     'conditions': [
       ['OS == "mac"', {
         'include_dirs': [
+          '<!(node -p "require(\'node-addon-api\').include_dir")',
           'System/Library/Frameworks/CoreFoundation.Framework/Headers',
           'System/Library/Frameworks/Carbon.Framework/Headers',
           'System/Library/Frameworks/ApplicationServices.framework/Headers',

package.json

@@ -9,9 +9,9 @@
     "test:darwin:linux": "jasmine test/**/*.js",
     "test-keyboard": "node test/keyboard.js",
     "test:win32": "jasmine test/**/*.js",
-    "install": "prebuild-install || node-gyp rebuild",
-    "install-debug": "prebuild-install || node-gyp rebuild --debug",
-    "prebuild": "prebuild --all"
+    "install": "prebuild-install --runtime napi || node-gyp rebuild",
+    "install-debug": "prebuild-install --runtime napi || node-gyp rebuild --debug",
+    "prebuild": "prebuild --all --runtime napi"
   },
   "repository": {
     "type": "git",
@@ -37,19 +37,24 @@
   "author": "Jason Stallings",
   "license": "MIT",
   "gypfile": true,
+  "binary": {
+    "napi_versions": [
+      3
+    ]
+  },
   "bugs": {
     "url": "https://github.com/octalmage/robotjs/issues"
   },
   "homepage": "https://github.com/octalmage/robotjs",
   "dependencies": {
-    "nan": "^2.14.2",
+    "node-addon-api": "^4.2.0",
     "prebuild-install": "^5.3.3"
   },
   "devDependencies": {
-    "tape": "^4.8.0",
     "jasmine": "^2.99.0",
     "prebuild": "^9.1.1",
     "run-script-os": "^1.0.3",
+    "tape": "^4.8.0",
     "targetpractice": "0.0.7"
   }
 }