Add catch rate option

[InsertCreativeName5]

Description

Add logic for custom catch rate modifier. Scales 0.5-3x, without making some things like Ratata automatic or others like Legendaries impossible. Fits in well with player simplicity, while allowing vanilla experience

Discord contact info

insertcreativenamehere

[resetes12]

Thanks! A pretty easy addition. However, there are a few things to do before I pull these changes:

• First of all, new saveblock options CAN'T be added in between other existing options, as they mess up savegames (the game reads bits and bytes in the same place, regardless of the name of the option). They must be added at the end, below u8 tx_Mode_TypeEffectiveness:1;
• Secondly, for existing savegames, the option will default to zero, which means that old players will have that option set to x0,5 catch rate. 1 must be x0,5 catch rate, while 0 has to be the default catch rate, even if by these numbers it doesn't make much sense.
• Thirdly, not that important, but still. The Catch Rate option needs to be in the difficulty category. It's a minor thing, but catch rate is not a "feature". You can add it below "Hard mode exp. gain". Beware that there's currently a max of 15-16 options in each menu, but I think this one fits.

If you manage to do these changes, I would gladly add them, and even wait for them to release 3.3!

[InsertCreativeName5]

Thanks! A pretty easy addition. However, there are a few things to do before I pull these changes:

* First of all, new saveblock options **CAN'T** be added in between other existing options, as they mess up savegames (the game reads bits and bytes in the same place, regardless of the name of the option). They must be added at the end, below `u8 tx_Mode_TypeEffectiveness:1;`

* Secondly, for existing savegames, the option will default to zero, which means that old players will have that option set to x0,5 catch rate. 1 **must** be x0,5 catch rate, while 0 has to be the default catch rate, even if by these numbers it doesn't make much sense.

* Thirdly, not that important, but still. The Catch Rate option needs to be in the difficulty category. It's a minor thing, but catch rate is not a "feature". You can add it below "Hard mode exp. gain". Beware that there's currently a max of 15-16 options in each menu, but I think this one fits.

If you manage to do these changes, I would gladly add them, and even wait for them to release 3.3!

Changes made, pipeline is failing build for some reason (maybe unrelated to change?), switched to draft until figured out

[InsertCreativeName5]

@resetes12 are you able to check the workflow? I think the compilation requires libpng package in the apt-get, or something like that. Compilation works fine on my PC, even when I run git clean -fdx in the repo first.

[resetes12]

All good, don't worry. I have zero clue about how the workflow stuff works, to be honest.

Thanks for your contribution!