Add skip keybind

https://github.com/ajayyy/SponsorBlock/issues/299

src/config.ts

@@ -10,6 +10,7 @@ interface SBConfig {
     defaultCategory: string,
     whitelistedChannels: string[],
     forceChannelCheck: boolean,
+    skipKeybind: string,
     startSponsorKeybind: string,
     submitKeybind: string,
     minutesSaved: number,
@@ -142,6 +143,7 @@ const Config: SBObject = {
         defaultCategory: "chooseACategory",
         whitelistedChannels: [],
         forceChannelCheck: false,
+        skipKeybind: "Enter",
         startSponsorKeybind: ";",
         submitKeybind: "'",
         minutesSaved: 0,