add an NSS find module
add a tweaked FindOpenSSL module and link and include it in interface
initial rev of SignedWalletTransaction that creates a message
droppable silent packets are added for dropped packets;

_currentJitterBufferFrames replaced with moving average of frames
available.  Downstream framesAvailable stat now includes the frames in
QAudioOutput as well as the ringbuffer.
use OpenSSL to create signed wallet transaction using hard-code key
Merge branch 'master' of github.com:birarda/hifi

Conflicts:
	interface/CMakeLists.txt
changed format label string a bit
renamed a function
re-added calculated desired frames to domain page stats
removed space
case statement style fix
Merge branch 'master' of https://github.com/highfidelity/hifi
add dialog to Menu to insert wallet private key
Merge pull request #3179 from wangyix/quick_audio_PR

Lost audio packets are replaced with silent frames in AudioMixer; AudioMixer silent-packet-dropping now enabled no matter what; Moving avg of audio frames available replaces _currentJitterBufferFrames
some updates to the BUILD guide for OpenSSL
fix min required OpenSSL version
more tweaks to sections in BUILD guide
more cleanup to dependencies section of cmake
Merge branch 'master' of https://github.com/highfidelity/hifi
fix for select_library_configurations in OpenSSL find module