[CMAKE] target_compile_definitions() calls: Remove (now) useless '-D' (#3490)

Documented as automatically removed, since CMake 3.12.4 at least.
https://cmake.org/cmake/help/v3.12/command/target_com

[CMAKE] target_compile_definitions() calls: Remove (now) useless '-D' (#3490)

Documented as automatically removed, since CMake 3.12.4 at least.
https://cmake.org/cmake/help/v3.12/command/target_compile_definitions.html

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[CMAKE] Get rid of the set_cpp macro

Instead of messing with global variables and the like, we introduce two target properties:
- WITH_CXX_EXCEPTIONS: if you want to use C++ exceptions
- WITH_CXX_

[CMAKE] Get rid of the set_cpp macro

Instead of messing with global variables and the like, we introduce two target properties:
- WITH_CXX_EXCEPTIONS: if you want to use C++ exceptions
- WITH_CXX_RTTI: if you need RTTI in your module
You can use the newly introduced set_target_cpp_properties function, with WITH_EXCEPTIONS and WITH_RTTI arguments
We also introduce two libraries :
- cpprt: for C++ runtime routines
- cppstl: for the C++ standard template library

NB: On GCC, this requires to create imported libraries with the related built-in libraries:libsupc++, limingwex, libstdc++

Finally, we manage the relevant flags with the ad-hoc generator expressions

So, if you don't need exceptions, nor RTTI, nor use any runtime at all: you simply have nothing else to do than add your C++ file to your module

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[CMAKE] Replace custom functions to built-in ones
add_target_compile_definitions -> target_compile_definitions
add_target_compile_flags -> target_compile_options
add_target_include_directories -> tar

[CMAKE] Replace custom functions to built-in ones
add_target_compile_definitions -> target_compile_definitions
add_target_compile_flags -> target_compile_options
add_target_include_directories -> target_include_directories

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Git conversion: Make reactos the root directory, move rosapps, rostests, wallpapers into modules, and delete rossubsys.