ExDBackend

[NRRPLT-8191] Generate schema parsers via Makefile

* [NRRPLT-8191] Added target for downloading and building of schemes
* [NRRPLT-8191] Added simplified target
* [NRRPLT-0000] Update .gitignore
* [NRRPLT-8191] Make schemas generation compatible with local install

Approved-by: Krzysztof Lebioda