Mark `TypeInfo` as `in` in aaA.
unittest for Thread.priority
Mark aaA function arguments with `in` and `inout`.
Mark aaA functions with `pure`, `nothrow`, and friends.
Apply aaA function signature changes to `object` module.
Override `equals` in `TypeInfo_AssociativeArray`.

Fixes part of Issue 10380.

Issue URL: http://d.puremagic.com/issues/show_bug.cgi?id=10380
use pthread_setschedprio where available

- on linux since glibc 2.3.4. (Jan 2005)
- on OSX and FreeBSD it's missing
add Thread.PRIORITY_DEFAULT and use Windows constants
add in contract to Thread.priority setter
Merge pull request #526 from dawgfoto/threadPriority

improve Thread priority
Fix "Unable to get/set thread priority" bug
Merge pull request #517 from mxfm/unabletoset

Attempt to fix "Unable to set thread priority" bug
Revert "Merge pull request #517 from mxfm/unabletoset"

This reverts commit 7df7e3043fdb139aa194dc0dfacaf42666dadd62, reversing
changes made to 73d3205773ab32e635afb83c29b5d709245a441d.
Fix Issue 10420.

Mark `core.exception` functions with `pure`, `nothrow`, and friends.
Require user-supplied assert hander to be `nothrow`.

Issue URL: http://d.puremagic.com/issues/show_bug.cgi?id=10420
Make assert handler in line with the other ones.
Make rest `TypeInfo`s `const` in aaA functions.
Remvoe redundant aaA functions attributes.
Merge pull request #527 from denis-sh/add-`core.exception`-functions-attributes

Fix Issue 10420 - Incorrect function attributes in `core.exception`
Fix issue #10436 - The runtime should print stack traces to stderr
Merge pull request #528 from CyberShadow/fix10436

Fix issue #10436 - The runtime should print stack traces to stderr