Torrent Queuing for Botched torrent (#83)

* Implement a queue for handling failed torrent

* Add checks for getting slots

* Few other cleanups, change some function names

internal/config/config.go

@@ -29,6 +29,7 @@ type Debrid struct {
 	Proxy            string   `json:"proxy,omitempty"`
 	UnpackRar        bool     `json:"unpack_rar,omitempty"`
 	AddSamples       bool     `json:"add_samples,omitempty"`
+	MinimumFreeSlot  int      `json:"minimum_free_slot,omitempty"` // Minimum active pots to use this debrid
 
 	UseWebDav bool `json:"use_webdav,omitempty"`
 	WebDav
@@ -384,3 +385,7 @@ func Reload() {
 	instance = nil
 	once = sync.Once{}
 }
+
+func DefaultFreeSlot() int {
+	return 10
+}