centralize escapables, kill "prefix comma continues a line"
space around operators batch #1
space around operators batch #2
space around operators batch #3
Merge pull request #1471 from blackwhale/regex-cleanup-2

Regex code cleanup
Mark std.string.indexOf as @safe
do reverse of a bytecode in lookbehinds
backtracking matcher works with reversed bytecode
ditto with Thompson matcher
cleanup to keep lookahead/lookbehind more in sync for future

Fix 64 bit issues, remove useless debug hook
Mark the constructor of std.string.StringException as nothorw
Merge pull request #1482 from 9rnsr/fix_win_timezone

Add "Africa/Tripoli" from/to "Libya Standard Time"
Merge pull request #1488 from tom-tan/nothrow-string-StringException

Mark the constructor of std.string.StringException as nothorw
Replace trusted lambda block with trusted nested function
Implement pure floor()/ceil().
Implement pure tan().
Implement pure atan().
Implement pure atan2().
Implement pure exp().
Implement pure expm1().