fix Issue 4757 - A forward reference error with return of inner defined struct
[style] fix indent
fix Issue 12334 - Cannot access frame pointer of nested class from inside lambda
Add Makefile rule for generating Exuberant Ctags tags file
Scan C++ headers (.h) aswell when generating tags
Fix layout and ECTAGS_FILES
partial fix for Issue 5570
Merge pull request #3372 from WalterBright/fix5570

partial fix for Issue 5570
Fixes Issue 648 - Document template mixin instantiations.
do dead code elimination in release with debug info mode
fix Issue 12350 - Assigning __traits(getAttributes) to variable crashes DMD
fix issue 3490 - DMD Never Inlines Functions that Could Throw
fix Issue 12352 - Consistently stop encoding return type of parent functions

Remove hack for Voldemort Type mangling
Merge pull request #1485 from AndrejMitrovic/Fix648_2

Issue 648 - Document template mixin instantiations.
Make temp variable for verbose a bool
setdebuglib and setdefault lib should be bools
response_expand should return bool
Remove unused variable
multiobj should be bool
isZeroInit should return a bool