Resolve "Create script to include commit in version string"

Closes #20

See merge request !7

split backend into a file for each contained aspect

See merge request johannes.mey/relast!6

- expected error output does not have to be in actual order, and can contain empty lines and comments which both will be ignored

Json pointer

See merge request johannes.mey/relast!5

Johannes Mey authored Oct 30, 2019 and René Schöne committed Oct 30, 2019

Implement JSON pointer (built-in) and manual pointer treatment with two examples (JSON pointer and relative JSON pointer)

Clean-up, document and rename some attributes.

See merge request johannes.mey/relast!4

- Changed error message for invalid redefinition

reordering of components is allowed

See merge request johannes.mey/relast!3

- Also add some tests for left direction

Emit filenames for error messages.

See merge request johannes.mey/relast!2

- Extended grammar to let TypeDecl and Relation have filename
- Extended error message to display and order first by filename
- Added testcase with multiple inputs having errors