Crash Fix:  Global set_animation is nil when trying to ride a dragon.

Change to mobs:set_animation fixes this.

Modernize code: Replace deprecated function calls

Fixed deprecated calls. Tiny whitespace cleanup.

remove conditional around first dragon

Dragonplus

* Added piloting to normal dragons
* Load dragon arrows always

* Split piloting functions to a separate file
* switched from lib_mount driving to object_fly

Cleanup

>Made wasps nest flammable and changed description from "Hive" to "Nest"
>Dragons now slow down in water, they will not be able to leave
>Fixed dragons attacking mobs whilst flying
>Improved dragon attacks - they are slower and the ice dragon can freeze
water
>all dragons now drop gems
>Increased spawn rate of boss dragons
>Improved ice texture

>the tortoise and panda can't jump as high
>the tortoise can be captured if it is tame

>added tortoise
>added giant rat
>added butterflies

adds wasps, hives, and the king of sting(wasp boss)

Baddies use API to despawn; also keep pig

>added golem, treeman, and skeleton
>fixed a problem with the destructive setting
>improved spawning for dragons