README and Installer from CMake build

[AnHeuermann]

Issue

Fixes OpenModelica/OpenModelica#14575.

Changes

• Added instructions to build installer to README.
• Added new input arguments to OpenModelicaSetup.nsi to make it usable outside of /c/dev/ or the OpenModelica repository.
  • OPENMODELICASOURCEDIR
  • OPENMODELICAHOME

[AnHeuermann]

Missing some dependencies with the CMake + UCRT64 build, see OpenModelica/OpenModelica#10939 (comment)

[jschueller]

would it be possible to document command-line install from the installer binary ?

I've tried:

OpenModelica-v1.25.5-64bit.exe /S /D="C:\Users\schueller\om" /CurrentUser

but it always answers "Access Denied" eventhough it looks like it should support user-install as the macro MULTIUSER_INSTALLMODE_DEFAULT_CURRENTUSER

see also

• https://nsis.sourceforge.io/Which_command_line_parameters_can_be_used_to_configure_installers%3F
• https://github.com/OpenModelica/OpenModelicaSetup/blob/master/OpenModelicaSetup.nsi#L34
• https://nsis.sourceforge.io/Docs/MultiUser/Readme.html

[AnHeuermann]

I never tried an automated install with the current user set explicitly. Action setup-openmodelica is installing on Windows using the winInstallOM function.

Also it looks like I completely forgot to finish this PR. Now I don't know what it was about 😆