Custom scripting, #song=, translations

- A song can be linked directly by adding "#song=<id>" to the url, replace `<id>` with the id in the database, after loading it jumps immediately jumps to the difficulty selection
- Added tutorial translations
- Fixed song preview not playing
- Use text fallback for the logo when there are no vectors
- Increased combo cache by 1 pixel
- A custom javascript file can be loaded from config.json by defining "custom_js" value
- Added lots of events to help writing custom js files: `version-link, title-screen, language-change, song-select, song-select-move, song-select-difficulty, song-select-back, about, about-link, tutorial, import-songs, import-songs-default, session, session-start, session-end, debug, load-song, load-song-player2, load-song-unfocused, load-song-cancel, load-song-error, game-start, key-events, p2-game-end, p2-disconnected, p2-abandoned, pause, unpause, pause-restart, pause-song-select, game-lag, scoresheet, scoresheet-player2`
- Event syntax example:
```js
addEventListener("game-start", event => {
	console.log("game-start", event.detail)
})
```

public/src/js/game.js

@@ -362,6 +362,7 @@ class Game{
 			this.view.gameDiv.classList.add("game-paused")
 			this.view.lastMousemove = this.view.getMS()
 			this.view.cursorHidden = false
+			pageEvents.send("pause")
 		}else{
 			assets.sounds["se_cancel"].play()
 			this.paused = false
@@ -370,6 +371,7 @@ class Game{
 			this.sndTime = currentDate - snd.buffer.getTime() * 1000
 			this.view.gameDiv.classList.remove("game-paused")
 			this.view.pointer()
+			pageEvents.send("unpause", currentDate - this.latestDate)
 		}
 	}
 	isPaused(){
@@ -391,6 +393,7 @@ class Game{
 				if(Math.abs(lag) >= 50){
 					this.startDate += lag
 					this.sndTime = sndTime
+					pageEvents.send("game-lag", lag)
 				}
 			}
 			this.elapsedTime = currentDate - this.startDate