Add generate script for commands and regenerate commands_32.yaml

[zlomzlom]

Hello!

I was considering adding a new translation for the documentation, but I discovered that there is currently no available proper way of generation commands YAML, so I've made a simple Python script using two third-party libs (polib and pyyaml) to generate commands_32.yaml file. The script is grabbing command files from src/commands and reading them using regural expressions (to read only command related info). Then, grabbing translations from po/, comparing them with commands' info, translating that info and dumping it into YAML file

I kinda tested it with my localhost aegisite's translation, everything should be fine

[seproDev]

I looked into the generation of this file a couple of years ago, and from what I could tell it was actually generated during runtime.
Your current approach can lead to incorrect data like the actual command is recent/keyframe and not recent/keyframes https://github.com/Aegisub/Aegisub/blob/6f546951b4f004da16ce19ba638bf3eedefb9f31/src/command/recent.cpp#L45

I think the generation for macros is also wrong, the command uses the registered macro and not the script name
i.e. automation/lua/macro-2-mkfullwitdh/Make fullwidth vs automation/lua/macro-2-mkfullwitdh/Make text fullwidth

[zlomzlom]

it was actually generated during runtime

Well, I have no idea how to accomplish that. I can only think of some workarounds for any issues