cpp: TODO: -Wunused-macros
cpp TODO file
cpp -CC? examples
cpp: #if <undefined> example
Added example for -Wshadow
Merge branch 'master' into feature/wshadow
Symtable searching for shadow declarations (-Wshadow)

Added note about for-loop (and if/while decl creation) shadowing.
Merged for- and block-decl checks, -Wshadow works in for()

And also if(int x = ...) and while().
Merge branch 'feature/wshadow'