Improving application startup flow.

Major improvements to distribution index loading.
Implemented new transitional UI for startup.
If **no** distribution index is loaded on startup, completion of startup will be prevented and the user will be shown a message displaying the issue.
Launch errors are now shown as overlays.
Many more minor fixes and enhancements.

app/assets/js/scripts/uibinder.js

@@ -7,18 +7,63 @@ const path          = require('path')
 const ConfigManager = require('./assets/js/configmanager.js')
 
 let rscShouldLoad = false
+let fatalStartupError = false
+
+function showMainUI(){
+    updateSelectedServer(AssetGuard.getServerById(ConfigManager.getLauncherDirectory(), ConfigManager.getSelectedServer()).name)
+    refreshServerStatus()
+    setTimeout(() => {
+        document.getElementById('frameBar').style.backgroundColor = 'rgba(1, 2, 1, 0.5)'
+        document.body.style.backgroundImage = `url('assets/images/backgrounds/${document.body.getAttribute('bkid')}.jpg')`
+        $('#main').show()
+
+        if(ConfigManager.isFirstLaunch()){
+            $('#welcomeContainer').fadeIn(1000)
+        } else {
+            $('#landingContainer').fadeIn(1000)
+        }
+
+        setTimeout(() => {
+            $('#loadingContainer').fadeOut(750, () => {
+                $('#loadSpinnerImage').removeClass('rotating')
+            })
+        }, 500)
+        
+    }, 750)
+    initNews()
+}
+
+function showFatalStartupError(){
+    setTimeout(() => {
+        $('#loadingContainer').fadeOut(250, () => {
+            document.getElementById('overlayContainer').style.background = 'none'
+            setOverlayContent(
+                'Fatal Error: Unable to Load Distribution Index',
+                'A connection could not be established to our servers to download the distribution index. No local copies were available to load. <br><br>The distribution index is an essential file which provides the latest server information. The launcher is unable to start without it. Ensure you are connected to the internet and relaunch the application.',
+                'Close'
+            )
+            setOverlayHandler(() => {
+                const window = remote.getCurrentWindow()
+                window.close()
+            })
+            toggleOverlay(true)
+        })
+    }, 750)
+}
 
 // Synchronous Listener
 document.addEventListener('readystatechange', function(){
 
     if (document.readyState === 'complete'){
         if(rscShouldLoad){
-            if(ConfigManager.isFirstLaunch()){
-                $('#welcomeContainer').fadeIn(500)
+            if(!fatalStartupError){
+                showMainUI()
             } else {
-                $('#landingContainer').fadeIn(500)
+                showFatalStartupError()
             }
-        }
+        } 
+    } else if(document.readyState === 'interactive'){
+        //toggleOverlay(true, 'loadingContent')
     }
 
     /*if (document.readyState === 'interactive'){
@@ -27,16 +72,19 @@ document.addEventListener('readystatechange', function(){
 }, false)
 
 // Actions that must be performed after the distribution index is downloaded.
-ipcRenderer.on('distributionIndexDone', (data) => {
-    updateSelectedServer(AssetGuard.getServerById(ConfigManager.getLauncherDirectory(), ConfigManager.getSelectedServer()).name)
-    refreshServerStatus()
-    if(document.readyState === 'complete'){
-        if(ConfigManager.isFirstLaunch()){
-            $('#welcomeContainer').fadeIn(500)
+ipcRenderer.on('distributionIndexDone', (event, data) => {
+    if(data != null) {
+        if(document.readyState === 'complete'){
+            showMainUI()
         } else {
-            $('#landingContainer').fadeIn(500)
+            rscShouldLoad = true
         }
     } else {
-        rscShouldLoad = true
+        fatalStartupError = true
+        if(document.readyState === 'complete'){
+           showFatalStartupError()
+        } else {
+            rscShouldLoad = true
+        }
     }
 })