Buildsystem/CMake: Change policy CMP0005 to NEW and corect some buildvariables accordingly

** Info from CMake:
**   The OLD behavior for this policy is to place definition values given to add_definitions directly in the generated build rules without attempting to escape anything.
**  The NEW behavior for this policy is to generate correct escapes for all native build tools automatically.

If this breaks build, let us know on irc : irc.rizon.net/#trinity

CMakeLists.txt

@@ -13,7 +13,11 @@ project(TrinityCore)
 
 # CMake policies (can not be handled elsewhere)
 cmake_minimum_required(VERSION 2.8)
-cmake_policy(SET CMP0005 OLD)
+cmake_policy(SET CMP0005 NEW)
+
+# add this options before PROJECT keyword
+set(CMAKE_DISABLE_SOURCE_CHANGES ON)
+set(CMAKE_DISABLE_IN_SOURCE_BUILD ON)
 
 # Set RPATH-handing (CMake parameters)
 set(CMAKE_SKIP_BUILD_RPATH 0)

cmake/compiler/clang/settings.cmake

@@ -1,5 +1,5 @@
 # Set build-directive (used in core to tell which buildtype we used)
-add_definitions(-D_BUILD_DIRECTIVE='"$(CONFIGURATION)"')
+add_definitions(-D_BUILD_DIRECTIVE="$(CONFIGURATION)")
 
 if(WITH_WARNINGS)
   set(WARNING_FLAGS "-W -Wall -Wextra -Winit-self -Wfatal-errors")

cmake/compiler/gcc/settings.cmake

@@ -1,5 +1,5 @@
 # Set build-directive (used in core to tell which buildtype we used)
-add_definitions(-D_BUILD_DIRECTIVE='"${CMAKE_BUILD_TYPE}"')
+add_definitions(-D_BUILD_DIRECTIVE="${CMAKE_BUILD_TYPE}")
 
 if(PLATFORM EQUAL 32)
   # Required on 32-bit systems to enable SSE2 (standard on x64)

cmake/compiler/msvc/settings.cmake

@@ -25,7 +25,7 @@ else()
 endif()
 
 # Set build-directive (used in core to tell which buildtype we used)
-add_definitions(-D_BUILD_DIRECTIVE=\\"$(ConfigurationName)\\")
+add_definitions(-D_BUILD_DIRECTIVE="$(ConfigurationName)")
 
 # multithreaded compiling on VS
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /MP")