Changeset 2620 for code/branches/buildsystem2

Added SourceFileUtilities.cmake:

• GET_ALL_HEADER_FILES: Macro that finds all header files in a directory
• SET_SOURCE_FILES: Functions to administrate source files among directories
• ADD_SOURCE_FILES: Like above but doesn't overwrite
• GENERATE_SOURCE_GROUPS: creates the source groups for the visual studio IDE according to the directory structure

Added FlagUtilities.cmake:

• SET_COMPILER_FLAGS and SET_LINKER_FLAGS. For details see the files. The functions should be able to do all you need…