FEXRootFSFetcher: Adds a new tool to help set up a new RootFS

This tool supports both a zenity and tty interface.
TTY will be presented if available while Zenity will be used otherwise.

This tool pulls a rootfs list from https://rootfs.fex-emu.org/
It then allows you to select a rootfs from the list, download it, place
it in to the correct working folder, extract it if desired, and set it
as the current default RootFS.

This requires curl and potentially zenity installed to use.
Maybe also unsquashfs if the user chooses to extract the image.

This is an all in one tool to quickly get a new user up and running.

Additionally if you pass in a file path in to the tool, it will generate
an xxhash of the file and exit out. This is the hash used to ensure the
files are valid.

Source/Tools/CMakeLists.txt

@@ -6,6 +6,7 @@ add_subdirectory(FEXConfig/)
 add_subdirectory(FEXGetConfig/)
 add_subdirectory(FEXMountDaemon/)
 add_subdirectory(FEXLogServer/)
+add_subdirectory(FEXRootFSFetcher/)
 
 set(NAME Opt)
 set(SRCS Opt.cpp)

Source/Tools/FEXRootFSFetcher/CMakeLists.txt

@@ -0,0 +1,24 @@
+set(NAME FEXRootFSFetcher)
+set(SRCS Main.cpp
+  XXFileHash.cpp)
+
+add_executable(${NAME} ${SRCS})
+list(APPEND LIBS FEXCore Common CommonCore)
+
+target_include_directories(${NAME} PRIVATE ${CMAKE_SOURCE_DIR}/Source/)
+
+if (CMAKE_BUILD_TYPE MATCHES "RELEASE")
+  target_link_options(${NAME}
+    PRIVATE
+      "LINKER:--gc-sections"
+      "LINKER:--strip-all"
+      "LINKER:--as-needed"
+  )
+endif()
+
+install(TARGETS ${NAME}
+  RUNTIME
+  DESTINATION bin
+  COMPONENT runtime)
+
+target_link_libraries(${NAME} PRIVATE ${LIBS} ${STATIC_PIE_OPTIONS} ${PTHREAD_LIB})