Implement a standalone HTML exporter

This is mostly a proof of concept right now; it shows that it is possible
to create a headless server application that exports a git repository
based data file as html.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

CMakeLists.txt

@@ -444,6 +444,10 @@ if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
 	add_dependencies(${SUBSURFACE_TARGET} generate_qtconf)
 endif()
 
+# build an automated html exporter
+add_executable(export-html EXCLUDE_FROM_ALL export-html.cpp qt-init.cpp qthelper.cpp ${SUBSURFACE_RESOURCES})
+target_link_libraries(export-html subsurface_corelib ${SUBSURFACE_LINK_LIBRARIES})
+
 # QTest based tests
 macro(TEST NAME FILE)
 	add_executable(${NAME} EXCLUDE_FROM_ALL tests/${FILE} ${SUBSURFACE_RESOURCES})