To be used later for advanced presets. For subscriptions in the form of (+ as prefix)
```
+ Subscription Name:
Music Videos:
- "https://url1.com/..."
Concerts:
- "https://url2.com/..."
```
Stores all the contents under the subscription name into the override variable
``subscription_map`` as a Map value. The above example is stored as:
```
{
"Music Videos": [
"https://url1.com/..."
],
"Concerts: [
"https://url2.com/..."
]
}
```
Advanced scripting is needed to dissect this Map variable into a usable preset
Readthedocs for ytdl-sub is getting a massive overhaul to both look and read like a modernized app. It is still very-much work-in-progress, stay tuned for more!
Huge thanks to @Svagtlys (aka Momo) for driving this
