Research chemical combination limit

[private-tristan]

Testmerges

#4003: 'Brings automatic weaponry to the marine and surv arsenal' by Zonespace27 at commit db622ab #3865: 'New UPP guns' by CapCamIII at commit 31c3087 #4063: 'Yautja Change Holder' by realforest2001 at commit 377eeb300e #4224: 'ARES Change Holder' by realforest2001 at commit 06e5019 #4178: 'Overwatch Console TGUI Refactor' by TheGamerdk at commit 815c211 #4067: 'Research Biohazard Lockdown' by realforest2001 at commit a71df91 #4229: 'fancy lighting' by harryob at commit c596140 #4231: 'Changes nutrition with blood loss' by morrowwolf at commit 2b93749

Description of the bug

when having a research chemical combination (in this case, defibing), if there are more than 4(?) chemicals, one of the chemicals (Neogenetic, MST) will be deleted. it might also reduce the levels (sometimes??)

What's the difference with what should have happened?

when a chemical combines, it'd only take as many levels as it can take/until it's full (MST 8 and CDP 1 should combine into MST 7 + defib 2).
and also for it to delete other chemicals in the paper

How do we reproduce this bug?

1. get a lot of research credits
2. add MST
3. add CDP
4. add any other effects
5. hit print
6. notice that a effect may or may not have vanished from your paper
   ...

Issue Bingo

• Issue could be reproduced at least once
• Issue happened in a recent (less than 7 days ago) round
• Couldn't find an existing issue about this (https://github.com/cmss13-devs/cmss13/issues)

[ItsVyzo]

Seeing as Research Synthesizes has been made into a TGUI and this has not been reported in over a year. Closing.