Inconsistent filename matching

[ajafff]

In some places file names are normalized before comparing to other paths. In other cases like files and exclude CLI arguments are handled case sensitive. Paths and globs from CLI arguments are allowed to be absolute.

Glob matching in configuration.ts is case sensitive and has special handling for *.ts and ./*.ts. These glob patterns need to be relative.

Globbing in runner.ts is always case-sensitive.

Note that #392 introduces a lot more inconsistency. There's probably the need for a case-insensitive path.relative