0030952: Draw Harness, ViewerTest - add command showing on-screen GUI for configuring material properties

Branch CR30952_1 has been created by kgv.

SHA-1: eaa7a81aa6343985e6f1278d9971f9432890c53c

Detailed log of new commits:

Author: kgv
Date: Thu Aug 29 11:04:56 2019 +0300

    0029528: Visualization, TKOpenGl - allow defining sRGB textures

    Quantity_Color definition has been modified to store RGB components
    in linear color space within Quantity_TOC_RGB type.
    Standard colors defined by Quantity_NameOfColor enumeration has been updated accordingly.
    New Quantity_TOC_sRGB type has been introduced to handle RGB components in non-linear sRGB color space.

    OpenGl_TextureFormat class definition has been moved to dedicated files.
    New method OpenGl_TextureFormat::FindFormat() replaces OpenGl_Texture::GetDataFormat().
    New method OpenGl_TextureFormat::FindSizedFormat() replaces OpenGl_FrameBuffer::getColorDataFormat()
    and OpenGl_FrameBuffer::getDepthDataFormat().

    Graphic3d_TextureRoot::IsColorMap() - introduced new property defining
    if RGB(A)8 image formats should be loaded as sRGB(A) textures or as data RGB(A) textures.
    OpenGl_Texture initialization methods have been extended with new theIsColorMap argument.

    vreadpixel - added argument -sRGB printing color in sRGB color space.

    Test cases have been updated to new sRGB rendered results.

Author: kgv
Date: Mon Sep 16 23:06:38 2019 +0300

    0030969: Coding Rules - refactor Quantity_Color.cxx color table definition

    The table of named colors has been compressed and moved out
    from Quantity_Color.cxx into Quantity_ColorTable.pxx.

    Quantity_NameOfColor - grayscale enumeration values have been re-ordered to fix discontinuity.
    Duplicating colors has been merged within enumeration:
      CHARTREUSE=CHARTREUSE1, GOLD=GOLD1, GREEN=GREEN1, ORANGE=ORANGE1,
      ORANGERED=ORANGERED1, RED=RED1, TOMATO=TOMATO1, YELLOW=YELLOW1.
    Added aliases to several other common colors:
      BLUE=BLUE1, CYAN=CYAN1, LIGHTCYAN=LIGHTCYAN1, MAGENTA=MAGENTA1.

    Quantity_Color::ColorToHex() now rounds-up float values to closest integer.
    Quantity_ColorRGBA::ColorToHex() - added method formatting color into hex with alpha component.

    Quantity_Color class definition has been cleaned to follow OCCT coding style.
    Quantity_Color now stores NCollection_Vec3<float> as class field instead of separate components.
    Removed unused class Quantity_ColorDefinitionError.

    New methods Quantity_Color::Convert_LinearRGB_To_sRGB() and Quantity_Color::Convert_sRGB_To_LinearRGB()
    converting RGB components from linear to non-linear sRGB colorspace and vice versa.
    Image_PixMap::PixelColor() and Image_PixMap::SetPixelColor() methods have been extended
    with an optional argument for performing linearization/delinearization of 8-bit sRGB pixel formats.

    Draw Harness command AISColor has been corrected to take color name instead of enumeration index.

Author: kgv
Date: Wed Jul 3 11:28:26 2019 +0300

    0029902: Data Exchange, XCAF - provide extended Material definition for visualization purposes

    Introduced new attribute XCAFDoc_VisMaterial storing visualization material definition.

Author: kgv
Date: Fri Sep 6 12:18:09 2019 +0300

    0030952: Draw Harness, ViewerTest - add command showing on-screen GUI for configuring material properties

Author: kgv
Date: Sat Sep 21 17:10:23 2019 +0300

    0030991: Draw Harness - ViewerTest::ParseColor() defines out-of-range alpha component

    ViewerTest::ParseColor() - fixed alpha component defined as 255 for RGB-only input.

    vdrawtext command now uses ViewerTest::ParseColor() for parsing color argument, so that it accepts hex.
    vreadpixel command now has been extended with -hex argument for printing color in hex format.

    Commands XSetColor, XGetColor, XGetShapeColor, XGetAllColors, XAddColor, XRemoveColor, XFindColor,
    XUnsetColor, XGetInstanceColor, XSetInstanceColor have been corrected to properly report syntax input errors
    and to accept color names and hex (by reusing ViewerTest::ParseColor()).