CMake: cleanup, project generation and other improvements

- Use EXCLUDE_FROM_ALL for FuzzyLite and GoogleTest to avoid inclusion of unneded headers and libraries into installers.
- Set minimum CMake version only in main CMakeLists.txt
- Set project name only in main CMakeLists.txt
- Visual Studio: add assign_source_group function to generate proper filesystem tree
- Visual Studio: set PROJECT_LABEL so generated projects have same names binaries on Windows
- Visual Studio: enabled USE_FOLDERS for projects grouping. This also possibly affect other IDEs.
- Added add_subdirectory_with_folder function to make sure 3rd-party libraries are affected by USE_FOLDERS.

scripting/erm/CMakeLists.txt

@@ -1,6 +1,3 @@
-project(vcmiERM)
-cmake_minimum_required(VERSION 2.6)
-
 include_directories(${CMAKE_HOME_DIRECTORY} ${CMAKE_HOME_DIRECTORY}/include ${CMAKE_CURRENT_SOURCE_DIRECTORY})
 
 set(lib_SRCS