- Add CMake Workflow Presets

- Upgrade to gitup workflow action v3
- Prepare use of git-flow
- Use CMake v3.21 variable PROJECT_IS_TOP_LEVEL
- Use CMAKE_DEBUG_POSTFIX to prevent name clashes
- Add more config files

gcovr.cfg

@@ -0,0 +1,19 @@
+root = .
+search-path = build
+
+filter = src/*
+filter = include/*
+filter = standalone/*
+
+exclude-directories = test
+exclude-directories = stagedir
+exclude-directories = build/_deps
+exclude-directories = .cache
+
+gcov-ignore-parse-errors = yes
+print-summary = yes
+
+html-details = build/gcovr.html
+
+cobertura-pretty = yes
+cobertura = build/cobertura.xml