PubSub system (#346)

* Add websocketpp dependency

* Initial pubsub commit

Renamed selection min and max variables to selectionMin and selectionMax
to bypass windows min/max macros being stupid.

TwitchAccount is now initialized with its User ID. It cannot be changed
after it has been initialized.

* Update openssl folder

* Update installation instructions

* Split up websocketpp dependency to its own code only and openssl.pri

* Add missing include to asio steady_timer

* Update dependencies for linux

dependencies/boost.pri

@@ -16,4 +16,6 @@ win32 {
     }
 
     LIBS += -L$$BOOST_DIRECTORY\\$$BOOST_LIB_SUFFIX
+} else {
+    LIBS += -lboost_system
 }

dependencies/openssl.pri

@@ -0,0 +1,12 @@
+win32 {
+    INCLUDEPATH += C:/local/openssl/include
+
+    LIBS += -LC:\local\openssl\lib
+
+    LIBS += -llibssl
+    LIBS += -llibcrypto
+} else {
+    PKGCONFIG += openssl
+
+    LIBS += -lssl -lcrypto
+}

dependencies/websocketpp.pri

@@ -0,0 +1 @@
+INCLUDEPATH += $$PWD/../lib/websocketpp