Add SynctaxView method

Signed-off-by: Sebastian Ramacher <sebastian+dev@ramacher.at>
Use SynctexView for --synctex-forward

Signed-off-by: Sebastian Ramacher <sebastian+dev@ramacher.at>
Adjust for different indices in SyncTex

Signed-off-by: Sebastian Ramacher <sebastian+dev@ramacher.at>
Some documentation

Signed-off-by: Sebastian Ramacher <sebastian+dev@ramacher.at>