Remove Surface Viewer stub

Implement "About" dialog

Fix compilation on case-sensitive OSX

Add missing FileType declarations in GuessFromExtension and GetFileTypeString

When compiling on a case-sensitive filesystem on OSX, cmake doesn't find
the FindUnicorn file, because it looks for Findunicorn.cmake. We should
uses the correct case to avoid this issue.

bc73004 a64_merge_interpret_blocks: Remove debug output
4e656ed tests/A64: Randomize PSTATE.<NZCV>
fd9530b A64: Optimization: Merge interpret blocks
3c9eb04 testenv: Use format constants
324f3fc tests/A64: Unicorn interface fixes
98ecbe7 tests/A64: Fuzz against unicorn
b1d38e7 tests/A64: Move TestEnvironment to own header
5218ad9 A64/data_processing_pcrel: bug: ADR{,P} instructions sign extend their immediate
b1a8c39 A64/data_processing_addsub: bug: {ADD,SUB}S (extended register) instructions write to ZR when d = 31
64827fb a64_emit_x64: bug: A64CallSupervisor trampled callee-save registers
1bfa04d emit_x64: bug: OP m/r64, imm32 form instructions sign-extend their immediate on x64
edadeea A64 inferface: Use two argument static_assert
9ab1304 A64: Add ExceptionRaised IR instruction
6843eed Update readme
7438d07 A64/translate: Add TranslateSingleInstruction function