premake5: Use precompiled headers.

This easily doubles the compilation speed!!1

src/Steam/Interfaces/SteamFriends.cpp

@@ -1,4 +1,4 @@
-#include "..\..\STDInclude.hpp"
+#include "STDInclude.hpp"
 
 using namespace Components;
 

src/Steam/Interfaces/SteamGameServer.cpp

@@ -1,4 +1,4 @@
-#include "..\..\STDInclude.hpp"
+#include "STDInclude.hpp"
 
 namespace Steam
 {

src/Steam/Interfaces/SteamMasterServerUpdater.cpp

@@ -1,4 +1,4 @@
-#include "..\..\STDInclude.hpp"
+#include "STDInclude.hpp"
 
 namespace Steam
 {

src/Steam/Interfaces/SteamMatchmaking.cpp

@@ -1,4 +1,4 @@
-#include "..\..\STDInclude.hpp"
+#include "STDInclude.hpp"
 
 namespace Steam
 {

src/Steam/Interfaces/SteamNetworking.cpp

@@ -1,4 +1,4 @@
-#include "..\..\STDInclude.hpp"
+#include "STDInclude.hpp"
 
 namespace Steam
 {

src/Steam/Interfaces/SteamRemoteStorage.cpp

@@ -1,4 +1,4 @@
-#include "..\..\STDInclude.hpp"
+#include "STDInclude.hpp"
 
 namespace Steam
 {

src/Steam/Interfaces/SteamUser.cpp

@@ -1,4 +1,4 @@
-#include "..\..\STDInclude.hpp"
+#include "STDInclude.hpp"
 
 namespace Steam
 {

src/Steam/Interfaces/SteamUtils.cpp

@@ -1,4 +1,4 @@
-#include "..\..\STDInclude.hpp"
+#include "STDInclude.hpp"
 
 namespace Steam
 {

src/Steam/Steam.cpp

@@ -1,4 +1,4 @@
-#include "..\STDInclude.hpp"
+#include "STDInclude.hpp"
 #include "Steam.hpp"
 
 namespace Steam