Initial

- Migrate MO Skyrim and vs15 themes to MO2. Fix some small things.
- Update gulp tasks to support generic themes
- Update `gulp` to `^4.0.0`

.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Typescript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+dist

Gulpfile.js

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+const gulp = require('gulp')
+const pump = require('pump')
+const sass = require('gulp-sass')
+const replace = require('gulp-replace')
+const rename = require('gulp-rename')
+const del = require('del')
+
+const { theme, dest } = require('minimist')(process.argv.slice(3))
+
+if (!theme) {
+  throw new Error(`'theme' parameter is required`)
+}
+
+const sassGlob = `themes/${theme}/sass/**/*.scss`
+const imagesGlob = `themes/${theme}/images/*.png`
+const destPath = dest || `./dist/`
+const imagesDest = `${destPath}/${theme}/`
+
+function clean() {
+  return del([`${imagesDest}/**`, `${destPath}/${theme}*.qss`], {
+    force: true
+  })
+}
+
+function copyImages(done) {
+  pump([gulp.src(imagesGlob), gulp.dest(imagesDest)], done)
+}
+
+function buildCss(done) {
+  pump(
+    [
+      gulp.src(sassGlob),
+      sass().on('error', sass.logError),
+      replace('/*POSTSASS ', ''),
+      replace(' POSTSASS*/', ''),
+      replace(/\nSTUB/g, ''),
+      rename({ extname: '.qss' }),
+      gulp.dest(destPath)
+    ],
+    done
+  )
+}
+
+exports.build = gulp.series(clean, gulp.parallel(buildCss, copyImages))
+
+exports.watch = () =>
+  gulp.watch(
+    sassGlob,
+    { ignoreInitial: false },
+    gulp.parallel(buildCss, copyImages)
+  )