Enable usage of @SuppressWarnings annotation instead of @silent in experimental mode

[REDNBLACK]

Motivation for the change:

• Other tools like a scalafix or WartRemover uses @SuppressWarning
• It's hard to type and remember import com.github.ghik.silencer.silent if u're not using IntelliJ or other IDE
• Requires useless provided dependency in classpath (silencer-lib), pollutes maven artifacts

@SuppressWarnings(Array("silencer")) works like @silent
@SuppressWarnings(Array("silencer:pattern")) works like @silent("pattern")

WDYT, @ghik ?

[SethTisue]

fyi @lrytz

[ghik]

First thought: since SuppressWarnings is used by other tools, some of these annotations may end up being interpreted by multiple tools at once, unintentionally, which doesn't seem good.

Also, since warning suppression will soon land in the compiler itself, I'm not sure if it's worth introducing the change into silencer, which will most likely become obsolete.

[ghik]

Scala 2.13.2 introduced @nowarn and now this is the standard, also partially supported by silencer. See this comment for explanation why @nowarn is better than @SuppressWarnings in Scala.