Add initial keyboard_input parser and tests

The current implementation SEGFAULTs when F characters are followed by
end of string.

test/keyboard_input/keyboard_input.pro

@@ -0,0 +1,16 @@
+QT += testlib
+QT -= gui
+CONFIG   += c++1z
+
+CONFIG += qt console warn_on depend_includepath testcase
+CONFIG -= app_bundle
+
+TEMPLATE = app
+
+INCLUDEPATH += ../../src/keyboard_input
+
+SOURCES +=  tst_parsertest.cpp \
+    ../../src/keyboard_input/input_parser.cpp
+
+HEADERS += \
+    ../../src/keyboard_input/input_parser.h