Added the chance for the scoop to damage items that it picks up, and …

…used the bonus attribute in the part definition to limit the volume of items picked up

data/json/vehicle_parts.json

@@ -5346,6 +5346,8 @@
        "durability" : 100,
        "epower" : -50,
        "size":400,
        "bonus":10,
        "damage_modifier":10,
        "item" : "v_scoop_item",
        "difficulty" : 1,
        "flags": ["SCOOP","CARGO","OBSTACLE"],

doc/JSON_FLAGS.md

@@ -428,6 +428,8 @@ These branches are also the valid entries for the categories of `dreams` in `dre
- ```POWER_TRANSFER``` Transmits power to and from an attached thingy (probably a vehicle)
- ```INITIAL_PART``` When starting a new vehicle via the construction menu, this vehicle part will be the initial part of the vehicle (if the used item matches the item required for this part).
- ```SCOOP``` Pulls items from underneath the vehicle to the cargo space of the part. Also mops up liquids. 
  - Uses the ```bonus``` tag to determine the maximum size of the item picked up
  - Uses the ```damage_modifier``` tag to determine the chance of damaging the items picked up(the lower the more likely).

## Ammo

src/vehicle.cpp

@@ -3776,6 +3776,8 @@ void vehicle::operate_scoop()
    std::vector<int> scoops = all_parts_with_feature( "SCOOP" );
    auto veh_points = get_points();
    for( int scoop : scoops ) {
        int chance_to_damage_item = parts[scoop].info().dmg_mod;
        int max_pickup_size = parts[scoop].info().bonus;
        const char *sound_msgs[] = {"Whirrrr", "Ker-chunk", "Swish", "Cugugugugug"};
        sounds::sound( global_pos3() + parts[scoop].precalc[0], rng( 20, 35 ), sound_msgs[rng( 0, 3 )] );
        for( const tripoint &position : veh_points ) {
@@ -3785,12 +3787,17 @@ void vehicle::operate_scoop()
                const map_stack q = g->m.i_at( position );
                size_t itemdex = 0;
                for( auto it : q ) {
                    if( it.weight() < 10000 && it.volume() < 10 ) {
                    if( it.volume() < max_pickup_size ) {
                        break;
                    }
                    itemdex++;
                }
                that_item_there = g->m.item_from( position, itemdex );
                if( one_in( chance_to_damage_item ) &&
                   that_item_there->damage < 4){//The scoop will not destroy the item, but it may damage it a bit.
                        that_item_there->damage += 1;
                        sounds::sound( position, 50, _("BEEEThump") );//The scoop gets a lot louder when breaking an item.
                }
                const int battery_deficit = discharge_battery( that_item_there->weight() * scoop_epower / rng( 8, 15 ) );
                if( battery_deficit != 0
                        && add_item( scoop, *that_item_there ) ) {