Move /fly, /abortion and many type definitions to libtrx

[rr-]

Checklist

• I have read the coding conventions
• I have added a changelog entry about what my pull request accomplishes, or it is an internal change

Description

LostArtefacts/libtrx#33

[aredfan]

I found a small bug. When you use /abortion in Lara's Home, dynamite sprites will appear, this is probably because there's no explosion sprite present in the level.

In the latest dev snapshot (4.4-4-g451e619) these sprites are hidden from view.

[lahm86]

The dynamite sprite is in the explosion slot (151) in the level file, and this is also the case in Vilcabamba. Other levels like Caves don't have it at all.

[rr-]

@aredfan @lahm86 fixed. Explosions in levels that had missing sprites and sounds should now only appear when using cheats – the mummies should behave as they previously did.

[aredfan]

@rr- There's just 2 levels remaining that lack explosions for Lara, both are in the Egyptian segment of TRUB.

[rr-]

@aredfan fixed. Also tidied injections up a bit.

[aredfan]

The explosions are working as expected in all 19 levels of TR1/UB. I've also checked to make sure the mummies are unaffected in this PR.

LGTM, and thank you. 👍