[*] change all std::unordered_map and std::unordered_set into ankerl::unordered_dense::map/set variants (#3442)

mainly doing this to reduce memory footprint; we all know how nice ankerl::unordered_dense is

in theory 4x faster - in practice these maps arent that "hot" anyways so not likely to have much perf gained

i just want to reduce mem fragmentation to ease my porting process, plus it helps other platforms as well (ahem weak Mediatek devices) :)

Signed-off-by: lizzie <[email protected]>

Co-authored-by: Caio Oliveira <[email protected]>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3442
Reviewed-by: DraVee <[email protected]>
Reviewed-by: CamilleLaVey <[email protected]>
Co-authored-by: lizzie <[email protected]>
Co-committed-by: lizzie <[email protected]>

CMakeLists.txt

@@ -576,6 +576,7 @@ add_subdirectory(externals)
 # pass targets from externals
 find_package(enet)
 find_package(MbedTLS)
+find_package(unordered_dense REQUIRED)
 
 if (ARCHITECTURE_x86 OR ARCHITECTURE_x86_64)
     find_package(xbyak)