[CMAKE] Some options are only supported by GCC, don't use them for clang

These are (so far):
-Wno-format-overflow
-Wno-nonnull-compare
-Wno-old-style-declaration
-Wno-unused-but-set-variable

[CMAKE] Introduce the atl_classes interface library

This takes care of adding the relvant include directory and the _ATL_NO_EXCEPTIONS define, if needed

[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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[SHELLBARS] Add missing psdk dependency.

[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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[ATL] Retire atlnew

[BROWSEUI/SHELLBARS] Add a PCH.

[CLANG-CL] Initial commit that allows us to compile ReactOS with clang-cl.

[BROWSEUI] CBandSiteMenu: Use CSimpleArray and CComHeapPtr.

[QCKLNCH] Remove qcklnch (#61)

- Move CIFSBand to the shellbars static lib which is linked to browseui and rshell.
- Move CQuickLaunchBand to rshell.
- Make nescessary adjustments so that they can

[QCKLNCH] Remove qcklnch (#61)

- Move CIFSBand to the shellbars static lib which is linked to browseui and rshell.
- Move CQuickLaunchBand to rshell.
- Make nescessary adjustments so that they can both be registered and instantiated.

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