Simplify code - bail out early, vreak loops early, reorder checks and declarations.
Merge pull request #336 from Dmitry-Me/SimplifyCodeBreakLoopsEarly

Simplify code - bail out early, vreak loops early, reorder checks and declarations
Tokenizer: Removed Tokenizer::simplifyConditionOperator(). Using the AST and ValueFlow, it should be much easier to parse ?: than before.
travis: replace kernel check with clang check.

Check clang instead of kernel, which is a lot faster.
Make clang check failure fatal to the build.
travis: run test_matchcompiler.py
travis: move CHECK_INTERNAL check up, remove "SRCDIR=build VERIFY=1" job in favor of "MAKEFLAGS="HAVE_RULES=yes" SRCDIR=build VERIFY=1"
travis: add -DCHECK_INTERNAL to the VERIFY=1 job to automatically fetch issues like #5869 via travis
travis: run cppcheck with --exception-handling where it matters, update clang repo hash.