Add new debugger for Unity 2019

Author: KSP-TaxiService

buildscripts/UnityDebug_2019/Mono.Cecil.dll

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+Quoted from JPLRepo 
+1) Install 2019.2.2f1 to utilise these two exe's to convert the pdb to mdb:
+<install directory>\Editor\Editor\Data\MonoBleedingEdge\bin\mono.exe
+<install directory>\Editor\Editor\Data\MonoBleedingEdge\lib\mono\4.5\pdb2mdb.exe
+
+2) Unity No longer uses PlayerConnectionConfigFile instead you edit boot.config file (in the data directory where this file used to go) and add the line:
+player-connection-debug=1
+
+3) For the game exe. You must copy the WindowsPlayer.exe (rename if you want) UnityPlayer.dll and WinPixEventRuntime.dll into the KSP install directory.
+
+4) Execute this sequence:
+"C:\Program Files\Unity\Editor\Data\MonoBleedingEdge\bin\mono.exe" "C:\Program Files\Unity\Editor\Data\MonoBleedingEdge\lib\mono\4.5\pdb2mdb.exe" "$(TargetFileName)"

buildscripts/UnityDebug_2019/Mono.CompilerServices.SymbolWriter.dll

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+rem Generate the MDB file needed by UnityVS and Monodevelop for debugging
+
+@echo off
+
+rem get parameters that are passed by visual studio post build event
+SET TargetName=%1
+
+rem make sure the initial working directory is the one containing the current script
+SET scriptPath=%~dp0
+
+echo Generating Unity Monodevelop Debug file...
+echo %TargetName%.dll -^> %TargetName%.dll.mdb
+"%scriptPath%\mono.exe" "%scriptPath%\pdb2mdb.exe" %TargetName%.dll