Cosmetic changes.

* use `nullptr` instead of `0` when it makes sense
* follow the same scheme when declaring variables
Re-indent file.
Update Inno Setup's Turkish translation.
Update Inno Setup's Korean translation.
Update lcms2 to a5bbc04
Enable SSE2 optimizations.

LAV Filters requires SSE2, see https://github.com/Nevcairiel/LAVFilters/commit/c0bf54f6863db9fd6c522179d049a8a5a6811884
Remove installer messages and checks for SSE.
Update coverity version.