Camera RAW images plugin

Plugin to read RAW camera images based on LibRAW.

- Supersedes MR !86 
- Support to LibRaw 0.20 and 0.21-Beta
- Support to multi-shot images: use imageCount(), jumpToImage() to select the wanted shot
- By default generates 16-bits sRGB images using camera white balance and interpolation AHD
- Should fix CCBUG: 454208: on my Debian with KF5.96 and the pulgin installed, I see the preview of all my RAW files (ARW included) in Dolphin

News compared to V1 (MR !86)

- Fix possible stack overflow due to the huge size of LibRaw class
- Fix image allocation with Qt 6 (make use of QImageIOHandler::allocateImage()) 
- Support to XMP metapacket
- Support to quality option. For e.g. you can focus on quality (q = 10) or speed (q = 1)
- oss-fuzz available [here](https://github.com/mircomir/oss-fuzz/tree/raw_fuzz/projects/kimageformats)

src/imageformats/CMakeLists.txt

@@ -130,6 +130,15 @@ install(FILES xcf.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugin
 
 ##################################
 
+if (LibRaw_FOUND)
+    kimageformats_add_plugin(kimg_raw SOURCES raw.cpp)
+    kde_enable_exceptions()
+    target_link_libraries(kimg_raw LibRaw::LibRaw)
+    install(FILES raw.desktop DESTINATION ${KDE_INSTALL_KSERVICESDIR}/qimageioplugins/)
+endif()
+
+##################################
+
 if (KF5Archive_FOUND)
 
     kimageformats_add_plugin(kimg_kra SOURCES kra.cpp)