Adds a fuckload of tool updates

also updates tgui

tools/appveyor/build.ps1

@@ -0,0 +1,10 @@
+if(!(Test-Path -Path "C:/byond")){
+    bash tools/appveyor/download_byond.sh
+    [System.IO.Compression.ZipFile]::ExtractToDirectory("C:/byond.zip", "C:/")
+    Remove-Item C:/byond.zip
+}
+
+Set-Location $env:APPVEYOR_BUILD_FOLDER
+
+&"C:/byond/bin/dm.exe" -max_errors 0 tgstation.dme
+exit $LASTEXITCODE

tools/appveyor/download_byond.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+set -e
+source dependencies.sh
+echo "Downloading BYOND version $BYOND_MAJOR.$BYOND_MINOR"
+curl "http://www.byond.com/download/build/$BYOND_MAJOR/$BYOND_MAJOR.${BYOND_MINOR}_byond.zip" -o C:/byond.zip