Added QuaZip

Added Elevation Downloading from NASA/USGS NED and SRTM sources (The
elevation services use by TT is really bad, at least for my area).
Usability cleanups

Author: altera2015

quazip/CMakeLists.txt

@@ -0,0 +1,54 @@
+project (QuaZip)
+cmake_minimum_required(VERSION 2.6)
+
+option(BUILD_WITH_QT4 "Build QuaZip with Qt4 no matter if Qt5 was found" OFF)
+
+if( NOT BUILD_WITH_QT4 )
+    # try Qt5 first, and prefer that if found
+    find_package(Qt5Core QUIET)
+endif()
+
+if (Qt5Core_FOUND)
+    set(QTCORE_LIBRARIES ${Qt5Core_LIBRARIES})
+    # if there is no QT_ROOT, try to deduce it from Qt QtCore include
+    if ("${QT_ROOT}" STREQUAL "")
+        set(QT_ROOT ${QT_QTCORE_INCLUDE_DIR}/../..)
+    endif()    
+    include_directories(${Qt5Core_INCLUDE_DIRS})
+
+    macro(qt_wrap_cpp)
+        qt5_wrap_cpp(${ARGN})
+    endmacro()
+else()
+    set(qt_min_version "4.5.0")
+    find_package(Qt4 REQUIRED)
+    set(QT_USE_QTGUI false)
+    include(${QT_USE_FILE})
+    include_directories(${QT_INCLUDES})
+    set(QTCORE_LIBRARIES ${QT_QTCORE_LIBRARY})
+
+    macro(qt_wrap_cpp)
+        qt4_wrap_cpp(${ARGN})
+    endmacro()
+endif()
+
+# Use system zlib on unix and Qt ZLIB on Windows
+IF(UNIX)
+	find_package(ZLIB REQUIRED)
+ELSE(UNIX)
+	SET(ZLIB_INCLUDE_DIRS "${QT_ROOT}/src/3rdparty/zlib" CACHE STRING "Path to ZLIB headers of Qt")
+	SET(ZLIB_LIBRARIES "")
+	IF(NOT EXISTS "${ZLIB_INCLUDE_DIRS}/zlib.h")
+		MESSAGE("Please specify a valid zlib include dir")
+	ENDIF(NOT EXISTS "${ZLIB_INCLUDE_DIRS}/zlib.h")
+ENDIF(UNIX)
+
+# All build libraries are moved to this directory
+SET(LIBRARY_OUTPUT_PATH ${CMAKE_BINARY_DIR})
+
+set(LIB_SUFFIX "" CACHE STRING "Define suffix of directory name (32/64)")
+set(LIB_DESTINATION "${CMAKE_INSTALL_PREFIX}/lib${LIB_SUFFIX}" CACHE STRING "Library directory name" FORCE)
+
+add_subdirectory(quazip)
+
+install(FILES FindQuaZip.cmake DESTINATION ${CMAKE_ROOT}/Modules)