[New Feature] Spawn multiple animation types concurrently

[Crimsonum]

First Check

• I added a very descriptive title to this issue.
• I used the GitHub search to find a similar issue and didn't find it.
• I have attached as much information as possible (screenshots, videos, links, etc).

Description

Animation types allow for all sorts of clever mechanics or workarounds. However, they usually require chaining several dummy, intermediary animations together, and the available options (e.g. TrailerAnim) are not always exact nor reliable. Having the option to spawn multiple animations at once would remove the need for such dummy anims.

Proposed Code (optional)

New keys for animation types.

Example:

; Fixed amounts
[FOO]
ParallelAnims=EXPLOMED,DBRIS1LG,DBRIS1SM ;specifies a list of anims that will spawn concurrently with this anim, at the same location.
ParallelCount=1,2,3 ;specifies the fixed amount of each parallel anim to spawn. Defaults to 1 each.

; Randomized amounts
[FOO2]
ParallelAnims=EXPLOMED,DBRIS1LG,DBRIS1SM
ParallelMinimums=1,0,0 ;specifies the minimum amount of each parallel anim to spawn. Defaults to 0 for each.
ParallelMaximums=1,2,3 ;specifies the maximum amount of each parallel anim to spawn.

ParallelCount is mutually exclusive with ParallelMinimums/ParallelMaximums; if ParallelCount is undefined and ParallelMaximums is defined, then choose randomly between ParallelMinimums and ParallelMaximums. Otherwise ParallelCount takes precedence.

Additional Context

No response