Replace RabbitCommon::CDir::GetOpenDirectory with QFileDialog::getExi… #128

Job	Run time
mingw / build_mingw (Release)	10m 5s
mingw / build_mingw (Debug)	10m 7s
android / build_android (Release, android_arm64_v8a, 6.5.1)	5m 53s
android / build_android (Release, android_armv7, 6.5.1)	5m 52s
android / build_android (Release, android_x86_64, 6.5.1)	5m 54s
msvc / build_msvc (Release, 6.5.1)	1s
msvc / build_msvc (Release, 5.15.2)	2m 20s
msvc / build_msvc (Release, 5.12.12)	2m 29s
msvc / build_msvc (Debug, 6.5.1)	2m 37s
msvc / build_msvc (Debug, 5.15.2)	2m 42s
msvc / build_msvc (Debug, 5.12.12)	2m 49s
ubuntu / build_ubuntu (Release)	6m 14s
ubuntu / build_ubuntu (Debug)	7m 14s
macos / build_macos (Release, 6.5.1, clang_64)	1s
macos / build_macos (Release, 5.15.2, clang_64)	1s
macos / build_macos (Release, 5.12.12, clang_64)	1s
macos / build_macos (Debug, 6.5.1, clang_64)	1s
macos / build_macos (Debug, 5.15.2, clang_64)	1s
macos / build_macos (Debug, 5.12.12, clang_64)	1s
deploy	1s
	1h 4m 24s

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