Complete refactor of project file structure

Fix incorrect handing of default node parameters in SSD subscription.
Fix unable to parse some Clash rule-providers (#289).
Fix not filtering inline comments in some Surge rulesets. (#285)
Add Cron task options.
Add clean context option for persisting a JS context across the whole request.
Replace JS engine with QuickJS.

cmake/FindLibCron.cmake

@@ -0,0 +1,13 @@
+find_path(LIBCRON_INCLUDE_DIR libcron/Cron.h)
+find_path(DATE_INCLUDE_DIR date/date.h)
+
+find_library(LIBCRON_LIBRARY liblibcron)
+
+set(LIBCRON_LIBRARIES "${LIBCRON_LIBRARY}")
+set(LIBCRON_INCLUDE_DIRS "${LIBCRON_INCLUDE_DIR} ${DATE_INCLUDE_DIR}")
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(libcron DEFAULT_MSG
+    LIBCRON_INCLUDE_DIRS LIBCRON_LIBRARY)
+
+mark_as_advanced(LIBCRON_INCLUDE_DIRS)

cmake/FindQuickJS.cmake

@@ -0,0 +1,11 @@
+find_path(QUICKJS_INCLUDE_DIRS quickjs/quickjs.h)
+
+find_library(QUICKJS_LIBRARY libquickjs)
+
+set(QUICKJS_LIBRARIES "${QUICKJS_LIBRARY}")
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(QuickJS DEFAULT_MSG
+    QUICKJS_INCLUDE_DIRS QUICKJS_LIBRARY)
+
+mark_as_advanced(QUICKJS_INCLUDE_DIRS QUICKJS_LIBRARY)