Add Community Created Mods and Fix Replay Filename Issue

[soundmud]

Thanks for your pull request. I cannot include it as is, but I'll do my best to take it into account. Don't hesitate to send your pull requests or issues more "atomically". No need to group them.

First, about the mods, I am trying to isolate them from the code and have them in packages.

Please try this experimental feature if you want:

1. edit cfg/package_servers.txt
2. remove the ";" from the second line
3. start SoundRTS
4. wait until the available packages are downloaded or updated (it should say "OK" every time a package is downloaded)
5. restart SoundRTS if the mods are not available in the options menu

To undo the change:

1. restore the ";" in the txt file
2. remove the zip files from user/downloaded/packages

That's all for now. More later.

[soundmud]

I will include a variant of your patch about replay files. I removed some redundancy and replaced the () which are not a tuple (it lacks a comma when there is one item) with a [] which doesn't need a comma. It was working anyway but it spelled the name instead of reading the name.

I might include the notice about pip and Linux later.