"Disable SQL code" option added for all types of objects. Except for
textboxes and base relationships (view-table rel. and fk relationships).
Introduced the pgmodeler-cli that handles model exports via command line

Created the class ExportHelper that handles the model exports

Minor changes on ModelObjectsWidget

Minor fixes on SchemaParser
Removed deprecated files COMPILING.md and PLUGINS.md

Due to some conflicts on Linux systes the subproject libutil was renamed
to libutils.

pgmodeler-cli implementation done.

start-* scripts removed. Since the env vars are set by the installer on
Windows and for Unix the env vars are set using the new pgmodeler.sh
script.