Configure clang to treat set of warnings as errors

To prevent slipping backwards in code cleanliness, configure clang to treat warnings as errors with the exception of following warnings that are still to be completely fixed:

• QT3DS-2214 -Wnoerror=unused-local-typedefs
• QT3DS-2216 -Wnoerror=inconsistent-missing-override
• QT3DS-2222 -Wnoerror=reorder
• QT3DS-2223 -Wnoerror=format
• QT3DS-2224 -Wnoerror=unused-function
• QT3DS-2227 -Wnoerror=unused-value
• QT3DS-2229 -Wnoerror=delete-non-virtual-dtor
• QT3DS-2234 -Wnoerror=unused-variable
• QT3DS-2235 -Wnoerror=overloaded-virtual
• QT3DS-2237 -Wnoerror=unused-private-field
• QT3DS-2238 -Wnoerror=comment
• QT3DS-2240 -Wnoerror=enum-compare
• QT3DS-2241 -Wnoerror=int-to-pointer-cast
• QT3DS-2242 -Wnoerror=int-to-void-pointer-cast
• QT3DS-2244 -Wnoerror=unused-lambda-capture
• QT3DS-2246 -Wnoerror=deprecated-declarations
• QT3DS-2247 -Wnoerror=pointer-bool-conversion
• QT3DS-2248 -Wnoerror=self-assign
• QT3DS-2249 -Wnoerror=tautological-compare
• QT3DS-2251 -Wnoerror=tautological-constant-out-of-range-compare
• QT3DS-TBD Wno-error=mismatched-tags
• QT3DS-TBD Wno-error=logical-op-parentheses

Also -Wnoerror=switch needs to be ignored until the fix for QT3DS-2293 is merged from 2.1 branch to master branch.