FileBrowser: add mime type #1565

Job	Run time
doxygen	0s
mingw	0s
android / build_android (Release, android_arm64_v8a, 6.6.2)	3m 8s
macos / build_macos (Release, 6.6.2, clang_64)	1s
android / build_android (Release, android_x86_64, 6.6.2)	3m 13s
macos / build_macos (Release, 5.15.2, clang_64)	59s
macos / build_macos (Release, 5.12.12, clang_64)	56s
macos / build_macos (Debug, 6.6.2, clang_64)	1m 6s
msvc / build_msvc (Release, 6.6.2)	1m 38s
macos / build_macos (Debug, 5.15.2, clang_64)	1m 2s
msvc / build_msvc (Release, 5.15.2)	1m 39s
macos / build_macos (Debug, 5.12.12, clang_64)	1m 12s
msvc / build_msvc (Release, 5.12.12)	1m 37s
msvc / build_msvc (Debug, 6.6.2)	1m 38s
msvc / build_msvc (Debug, 5.15.2)	1m 38s
msvc / build_msvc (Debug, 5.12.12)	1m 35s
ubuntu / build_ubuntu (Release)	2m 10s
ubuntu / build_ubuntu (Debug)	2m 6s
deploy	0s
	25m 38s

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