Improve coverage

[MasseGuillaume]

Boom 100%.

Bugs found with this PR:

• Lit.Double, Lit.Float, Lit.Long, Lit.Char, ... was using Tree.syntax (eg Tokens).
• Pat.Xml was not implemented
• Mod.Inline was not implemented

I also removed some dead code.

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@04ecf2f). Click here to learn what that means. The diff coverage is 90.74%.

@@            Coverage Diff            @@
##             master      #20   +/-   ##
=========================================
  Coverage          ?   68.67%           
=========================================
  Files             ?       16           
  Lines             ?      996           
  Branches          ?       74           
=========================================
  Hits              ?      684           
  Misses            ?      312           
  Partials          ?        0

Impacted Files	Coverage Δ
...rc/main/scala/org/scalafmt/internal/TokenOps.scala	80% <ø> (ø)
.../main/scala/org/scalafmt/internal/TreeDocOps.scala	99.22% <100%> (ø)
...main/scala/org/scalafmt/internal/TreePrinter.scala	100% <100%> (ø)
.../main/scala/org/scalafmt/internal/ScalaToken.scala	100% <100%> (ø)
...cala/org/scalafmt/tests/BaseScalaPrinterTest.scala	74.28% <80.76%> (ø)

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[MasseGuillaume]

@olafurpg ^ so pretty!