PB203 DMR upgrade for BD v21 (Now with Expansion version) addon

This is a rifle upgrader for Brutal Doom v21 Gold in the form of the UAC 30 DMR from Project Brutality 2.03. Which I made on the tail-end of a weekend of learning DECORATE as part of a modding/combining spree, after a dream where I saw a mod of this on here, only to look it up and only find a rifle skin/sound replacement with the black version of the DMR, and nothing else.

Credit to: Project Brutality team for the PB2.03 DMR sprites and audio.

@IDDQD_1337: His Phalanx SFR-T3 addon for the DECORATE this mod was based on, modified heavily of course.

@⋆Ƅarge™: His Sniper Rifle v2 mod that I reverse-engineered to figure out how he got the M55 to be treated as an upgrader to the M50 rather than as additional or a replacement, and applying the newfound knowledge to get this mod to work as intended.

SLADE: For me discovering how Doom sprites have positioning data that I have to manually adjust using the application, much to my pain and misery.

ChebMaster: For making a remaster of Extermination Day that only runs on BDv21 Gold, which motivated me to start learning DECORATE (And a little bit of ACS) on the fly, as I bashed a ton of other, disparate weapon addons together that otherwise don't play together because of spawners because I didn't want to give up a PB-like experience to play through it, leading to a mod list that looks like the grocery receipt from Hell, but somehow actually works.

PS: The spawn rate from RifleZombieman drops is RIFLE 128, DMR 8; and the spawnerreplacer in case the map plops rifles on it directly is 12 to 128, probably...
(I still don't 100% know how the MARN part works.)

It's purpose as an upgrade rather than a full replacement means the Assault rifle will remain as the early-mid-game workhorse, without either giving the player a Hellknight-slayer right at the start, or "overloading the scroll" with redundancy if you've got a bajillion other additional weapon mods loaded in your Brutal Doom playthrough (like I have).

So yeah, get to popping the Imps and Zombiemen in their ramparts from the start outside the Hell Noble's big mansion with the Bowser's castle remix-sounding music in the background.

EDIT: Forgot to remove a stray sound file that was being used for testing.

EDIT 2: Slight damage buff, added the BRIGHT flag to the pickup, cleaned up select/deselect animations, removed an unused frame. (Also, thanks stranger for making me realize I forgot to mention that the spawn code is summon DMRSpawner)

EDIT 3: Now includes a version for the BDv21 Expansion (.14.1 anyway, probably works on older ones) and tweaked the spawning odds for both versions. It should not take a mere 3 maps on average into EDAY to end up with one anymore. (Now probably 7 to 12 maps in, estimated from the number of times I spammed "summon RifleDrop" into the console.)

EDIT 4: Fixed two serious bugs with reloading. And got the "on-map" spawners to work properly for the Gold version.

EDIT 4.1: Whoops, don't know how that happened. Shouldn't error out now. On a side note, I learned DooM really enforces that sprites must have a 4 character prefix. New modders, make of that what you will.