Added drag/drop functionality to the add mods button.

You can now drag one or more files onto the add mods button in order to add them to the mods directory. Only jar, litemod, and zip files will be moved.
Changed eslint to use a single configuration file, with overrides for the UI scripts.
Now using fs-extra, replace usages of rimraf and mkdirp with fs-extra functions.

app/assets/js/processbuilder.js

@@ -1,11 +1,9 @@
 const AdmZip                = require('adm-zip')
 const child_process         = require('child_process')
 const crypto                = require('crypto')
-const fs                    = require('fs')
-const mkpath                = require('mkdirp')
+const fs                    = require('fs-extra')
 const os                    = require('os')
 const path                  = require('path')
-const rimraf                = require('rimraf')
 const {URL}                 = require('url')
 
 const { Library }           = require('./assetguard')
@@ -36,7 +34,7 @@ class ProcessBuilder {
      * Convienence method to run the functions typically used to build a process.
      */
     build(){
-        mkpath.sync(this.gameDir)
+        fs.ensureDirSync(this.gameDir)
         const tempNativePath = path.join(os.tmpdir(), ConfigManager.getTempNativeFolder(), crypto.pseudoRandomBytes(16).toString('hex'))
         process.throwDeprecation = true
         this.setupLiteLoader()
@@ -74,7 +72,7 @@ class ProcessBuilder {
         })
         child.on('close', (code, signal) => {
             logger.log('Exited with code', code)
-            rimraf(tempNativePath, (err) => {
+            fs.remove(tempNativePath, (err) => {
                 if(err){
                     logger.warn('Error while deleting temp dir', err)
                 } else {
@@ -364,7 +362,7 @@ class ProcessBuilder {
         const libs = []
 
         const libArr = this.versionData.libraries
-        mkpath.sync(tempNativePath)
+        fs.ensureDirSync(tempNativePath)
         for(let i=0; i<libArr.length; i++){
             const lib = libArr[i]
             if(Library.validateRules(lib.rules)){