Remove file-descriptor specific wait implementation to PosixFdHandle class
which breaks on waits of non-fd handles.
Replace with PosixConditionHandle and extend to support auto reset and
initial values.
Simplify mutex and conditional variable use with stdlib versions which
wrap these primitives but provide better C++ interface.
Test Event and Reset
Implement HighResolutionTimer for Posix by using native timers.
Callbacks are triggered with realtime interrupts if they are supported.
Create an enum to track user-defined interrupts as well as an initializer and
handler to register these interrupts per thread.
Add test cases for timers for both single and multiple.
Fix Sleep function to continue sleeping if interrupted by system.
Add local .gdbinit to ignore signal 34 which is used by high res timer
Add Sleep Test for 50ms.
Fix Sleep under linux that was using microseconds as nanoseconds.
Factor timespec creation to template function using div/mod and nanoseconds
from duration cast.
