- added github action for CI and codeql analysis

[chcg]

• fixed compiler warnings
• removed broken cmd post scripts (the movement of the resulting binary could be also achieved by modifying the out folder in the build settings, see e.g. https://github.com/deadem/notepad-pp-linter/blob/master/linter.vcxproj#L71)
• added multithreaded build option
• added sdl lifecycle check
• removed deprecated option minimal rebuild

See Github CI action: https://github.com/chcg/notepad-pp-linter/actions/runs/387619520 Appveyor: https://ci.appveyor.com/project/chcg/notepad-pp-linter/builds/36547579