csolution falsely reports file reference using symbolic link as case inconsistency

[andbararm]

When a source file is added to a project via a path containing a symbolic link of the file system of the OS, csolution falsely issues a warning like:

csolution warning: example_project.cproject.yml:12:17 - './src/test.c' has case inconsistency, use '../src/test.c' instead

while ./src/ is a symbolic link to ../src/.

On Windows, the symbolic link can be created with the mklink command in admin mode or with Developer Mode enabled.

csolutiuon should not issue a warning when symlinks are used. Or, if symlinks are also considered a protablility concern, a different message should be issued.

[jkrech]

Review the implications for supporting Symbolic Links in CMSIS-Toolbox - traditionally symbolic links are not "well supported" on windows.
If the file reference specified in the yml file is different from the location resolution provided by the file system, does not match case sensitive, we assume a case mismatch.