Click events are improperly named as touch event

Click event should be named as Click event, not touch event

It also [should be prevented by preceding drag event](https://github.com/LunaTK/CustomMapView/issues/2)

### Examples
In `MarkerLayer.kt`
```kotlin
private fun isTouchInsidePopup(x: Float, y: Float): Boolean
```
```kotlin
override fun onTouch(x: Float, y: Float, action: Int)
```