Major plugin refactor and cleanup.

Switched to POCO library for unified platform/library interface.
Deprecated the external module API. It was creating more problems than solving.
Removed most built-in libraries in favor of system libraries for easier maintenance.
Cleaned and secured code with help from static analyzers.

vendor/POCO/Zip/samples/zip/CMakeLists.txt

@@ -0,0 +1,10 @@
+set(SAMPLE_NAME "sample-zip")
+
+set(LOCAL_SRCS "")
+aux_source_directory(src LOCAL_SRCS)
+
+add_executable(sample-zip src/zip.cpp)
+if(WINCE)
+	set_target_properties(sample-zip PROPERTIES LINK_FLAGS "/ENTRY:wmainCRTStartup")
+endif()
+target_link_libraries(sample-zip PUBLIC Poco::Zip Poco::Util Poco::XML)