Necessary fixes for VS 2017 build

# = CAMPVis - Yet another medical visualization framework =====================

PROJECT(CAMPVis)

CMAKE_MINIMUM_REQUIRED(VERSION 3.0.2 FATAL_ERROR)

cmake_policy(SET CMP0020 NEW)

PROJECT(CAMPVis)

SET(CAMPVIS_VERSION 1.0.0)

# = Global Build Options ======================================================

        SET(TbbCompilerDirectory "vc12")    

	ELSEIF(CAMPVIS_MSVC14)

        SET(TbbCompilerDirectory "vc14")

    ELSEIF(CAMPVIS_MSVC15)

        SET(TbbCompilerDirectory "vc14")

    ELSE()

        MESSAGE(WARNING "Compiler not supported by makefile, you might be able to fix that...")

    ENDIF(CAMPVIS_MSVC2010)

ELSEIF(${CMAKE_GENERATOR} STREQUAL "Visual Studio 14 Win64" OR ${CMAKE_GENERATOR} STREQUAL "Visual Studio 14 2015 Win64")

    SET(CAMPVIS_MSVC14 TRUE)

    SET(CAMPVIS_WIN64 TRUE)

    MESSAGE("Visual Studio 12 Build (64 Bit)")

    MESSAGE("Visual Studio 14 Build (64 Bit)")

ELSEIF(${CMAKE_GENERATOR} STREQUAL "Visual Studio 15 Win64" OR ${CMAKE_GENERATOR} STREQUAL "Visual Studio 15 2017 Win64")

    SET(CAMPVIS_MSVC15 TRUE)

    SET(CAMPVIS_WIN64 TRUE)

    MESSAGE("Visual Studio 15 Build (64 Bit)")

ELSEIF(${CMAKE_GENERATOR} MATCHES "NMake") 

    SET(CAMPVIS_NMAKE TRUE)

        const std::string& name,

        const std::string& title,

        const T& value,

        const T& minValue = T(0.0f),

        const T& maxValue = T(1.0f),

        const T& stepValue = T(0.01f))

        const T& minValue,

        const T& maxValue,

        const T& stepValue)

        : Vec4Property(name, title, value, minValue, maxValue, stepValue)

    {

	frustum.cpp

	glcanvas.cpp

	glcontextmanager.cpp

	gltextureformattraits.cpp

	gpucapabilities.cpp

	gpucapabilitieswindows.cpp

	imageunit.cpp