Remove trailing spaces.
Fixes Issue 5316 - Add character-separated elements support for arrays and associative arrays.
Fix Issue 12494 - to!string(enum) incorrect value
Fix Appender constructor
Merge pull request #2059 from monarchdodra/12494

Fix  Issue 12494 - Regression (2.064): to!string(enum) returns incorrect value
Merge pull request #2049 from AndrejMitrovic/Fix5316

std.getopt: Add character-separated elements support for arrays and associative arrays
Merge pull request #2045 from monarchdodra/appenderConstruct

Fix Appender constructor signature
Re-implement reduce.