Remove tagbar as it's a possible cause for slowdown

Found tagbar to be a contributor when profiling scrolling text in Vim:

    :profile start profile.log
    :profile func *
    :profile file *
    " At this point do slow actions
    :profile pause
    :noautocmd qall!
Revert "Added Scala plugin"

This reverts commit 0ae0e7bf8c43a4cd345180cb3068e9065f187f27.
Increase font size (12 -> 15)
Revert "Remove tagbar as it's a possible cause for slowdown"

This reverts commit 55079bb35d1b6e73b98bca24e1813072daa1e5ba.