Upgrade Unity from 2018 LTS to Unity 2019 LTS

[TheYellowArchitect]

Required for Mirror netcoding framework which allows for proper Online Multiplayer

Mirror officially supports Unity 2020+, unofficially also 2019 LTS
I did upgrade Double Damnation from 2018.1 to 2018 LTS without any noticeable issues (can't playtest everything, e.g. physics autism)

Porting Mirror, I get namespace issues, which even if I manually resolve, I cannot resolve Steamworks namespace problems. So, to import Mirror, Double Damnation needs Unity 2019 LTS.

yet...
Upgrading into 2019 LTS, straight up breaks TextMeshPro

In javascript words, another day of goblin development.
In simpler words, dependencies fucked me up, and even if I spend a full week, I cannot progress. Unless I find some insane hack, or spend a month writing down each text mesh component on a .txt and add TMPro components and re-write the values of each one (hello, SNES gamedevelopment?)

The only hope I have is this working

[TheYellowArchitect]

I finished this earlier today. The link above saved me pretty much. A utility for converting TMPro onto a package.
It sadly didn't work out of the box, and I spent hours on trial and error ("just replace the unity cache of appdata with these 2 json files, right before you scan fonts, bro"), but it ultimately worked and I am grateful. Bless those who make tools to cover for "breaks compatibility" features.

Nothing seems broken, the project seems the same, plays the same (didn't playtest for more than 4 minutes)
Online Multiplayer seems possible. The question is, will it be on time for release?