Allow env var to use %LOCALAPPDATA% in bot.toml

[SubparN0va]

Allow the use of %LOCALAPPDATA%\RLBot5\bots\torch-archive in the bot.toml to set the path of torch. Currently, the bot either has to be placed in the RLBot folder or the torch path has to be hardcoded. Doing this would allow GGLBots to stored anywhere, which is good for private bots because storing them in the bot folder is volatile since it can delete your stuff.

[NicEastvillage]

Virx has already been working on something like this ( #118 ) where the gui will tells the bots where torch is through environment vars. I don't know if it is 100% done.

[SubparN0va]

Yeah I talked to him about this already and he asked me to make an issue here. He completed the effort to allow setting the torch location but it still doesn't allow for %LOCALAPPDATA% which is the last piece we need to really make this work

[VirxEC]

the issue comes down to how to resolve this between the different platforms

[VirxEC]

I propose the following syntax:

[settings.environment]
COMMON_VAR = "common-value"

[settings.environment.windows]
TORCH_HOME_EXAMPLE = '%LOCALAPPDATA%\RLBot5\bots\torch-archive'

[settings.environment.linux]
TORCH_HOME_EXAMPLE = '$HOME/.local/share/RLBot5/bots/torch-archive'

now you wouldn't actually do this, you would set PATH, this is just an example

[VirxEC]

I should clarify that env vars are only evaluated under the .windows/.linux sections. This preserves the old behavior while adding this new functionality in a clean way. (imo)