[VIM] Fix <Leader>T behavior
Update submodules
[VIM] Add rust syntax highlighter vimball
[VIM] Remove tagbar plugin.

I use it pretty rarely, but it slows down startup time twice for me.
Startuptime profile with tagbar:

    ... skipped ...
    525.337  026.258: opening buffers
    525.556  000.219: BufEnter autocommands
    525.560  000.004: editing files in windows
    530.181  004.621: VimEnter autocommands
    530.186  000.005: before starting main loop
    534.073  002.597  002.597: sourcing /home/ixti/.vim/bundle/tagbar/autoload/tagbar.vim
    1247.829  716.046: first screen update
    1247.833  000.004: --- VIM STARTED ---

Without tagbar:

    ... skipped ...
    548.901  046.067: opening buffers
    549.263  000.362: BufEnter autocommands
    549.269  000.006: editing files in windows
    557.586  008.317: VimEnter autocommands
    557.597  000.011: before starting main loop
    561.528  003.931: first screen update
    561.532  000.004: --- VIM STARTED ---