- ignore missing expected output resources in this mode
- update `BaselineWriter` to avoid `IOException`s (file access issues)
- serialize file operations
- one file handle per file
- repeatedly `rm TestFiles/CodeGenerator/Output/*; `dnx . test`; no errors
also
- add generation of design-time line mappings
- fix ChunkGenerator -> CodeGenerator typo in path names
- update files only if they have changed
- new `TestFiles.Exists()` method to support this check
- do not check results in `CSharpCodeBuilderTests` if `GENERATE_BASELINES` set
nits:
- update BOM in CodeBlockWithTextElement.cs to avoid future `git diff`s
- use more `var` and improve variable names in `TestFile`
- wrap long lines
d545f47fe4