Merge pull request #3765 from AndrewEdwards/2.066

Regression fixes for 2.066.0-b4
Merge pull request #3756 from schuetzm/fix-uninitialized-storage-class

Fix uninitialized variable
Merge pull request #3766 from 9rnsr/2.066

Cherry-picking commits from master to 2.066 branch (for beta4)
Do not call constructors from the glue layer (lib*)
Make construction of SignExtendedNumber explicit
Remove unnecessary line splicing in clone.c
Make color ddmd-friendly
Make narrowing cast explicit
Use explicit MOD type to avoid narrowing conversions from unsigned int
Merge pull request #3770 from yebblies/gluector

[DDMD] Do not call constructors from the glue layer (lib*)
Merge pull request #3772 from yebblies/linesplice

[DDMD] Remove unnecessary line splicing in clone.c
Merge pull request #3771 from yebblies/signext

[DDMD] Make construction of SignExtendedNumber explicit
Merge pull request #3769 from yebblies/DDMDMOD

[DDMD] Use explicit MOD type to avoid narrowing conversions from unsigned int
Merge pull request #3768 from yebblies/paintAsTypeddmd

[DDMD] Make narrowing cast explicit
Merge pull request #3767 from yebblies/ddmdcolor

[DDMD] Make color ddmd-friendly
Merge pull request #3764 from 9rnsr/fix13131

Issue 13131 - [2.066-b3] dmd: glue.c:1492: unsigned int totym(Type*): Assertion `0' failed.
fix Issue 13127 - Cannot deduce function with int[][] argument and "in" parameter
Merge pull request #3763 from 9rnsr/fix13127

[REG2.066a] Issue 13127 - Cannot deduce function with int[][] argument and "in" parameter
Merge pull request #3613 from WalterBright/hpohl-opt

Increase allocation chunk size + minor refactoring
Merge pull request #3745 from economicmodeling/coverage_test_case

Added test case for druntime pull request 830.