StimBuff,commonLibs: Add libattachmentSupport, move fnptrs into .cpp files

We move the methods in StimulusBuffer whose addresses are taken during
program execution into a separate static lib. This guarantees that
they'll have their own, single vaddr at runtime, at least within
each independent code module.

commonLibs/attachmentSupport/CMakeLists.txt

@@ -0,0 +1,15 @@
+add_library(attachmentSupport STATIC
+	attachmentSupport.cpp
+)
+
+set_target_properties(attachmentSupport PROPERTIES
+	POSITION_INDEPENDENT_CODE ON
+)
+
+target_include_directories(attachmentSupport PUBLIC
+	${Boost_INCLUDE_DIRS}
+	${CMAKE_SOURCE_DIR}/include
+	${CMAKE_BINARY_DIR}/include
+)
+
+target_link_libraries(attachmentSupport ${Boost_LIBRARIES})