SOS Mode, UI improvements

An "SOS" mode has been added to Lanterne, to continuously flash the
Morse code distress signal.  Also, the "torch" window has been replaced
by a single button, the UI has been made more finger-friendly, QSettings
support has been added, some bugs fixed, and package meta-data improved.
# Please enter the commit message for your changes. Lines starting
# with '#' will be ignored, and an empty message aborts the commit.
# On branch master
# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
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#	modified:   ../../doc/about.html
#	modified:   ../../lanaboutform.ui
#	modified:   ../../lanflashled.cpp
#	modified:   ../../lanflashled.h
#	modified:   ../../lanmorseform.cpp
#	modified:   ../../lanmorseform.h
#	modified:   ../../lanmorseform.ui
#	modified:   ../../lanstrobeform.cpp
#	modified:   ../../lanstrobeform.ui
#	modified:   ../../lanterne.pro
#	deleted:    ../../lantorchform.cpp
#	deleted:    ../../lantorchform.h
#	deleted:    ../../lantorchform.ui
#	modified:   ../../mainwindow.cpp
#	modified:   ../../mainwindow.h
#	modified:   ../../mainwindow.ui
#	modified:   changelog
#	modified:   control
#
# Untracked files:
#   (use "git add <file>..." to include in what will be committed)
#
#	../../lanterne.pro.user
