New DB structure with prop table.

[thatchinkumar2005]

--new prop table.
--dropped building_type, mine_type and defender_type from block_type table.
--dropped radius from defender_type and mine_type tables.
--added category_id to building_type.
--new dummy data for the new structure.
--modified models.rs and schema.rs
--defender_type inner joined with prop for defender utils for range as radius.
--mine_type inner joined with prop for mine utils for range as radius.
--building_type inner joined with prop for building utils for range and frequency.
--building_type, defender_type and mine_type changed to category_id after filtering with category..