Switch the recent files manager to the "command processor on thread" pattern, to avoid blocking the main thread

[hrydgard]

This removes all instances (except join-thread-on-quit) where the main thread was previously waiting for the cleaning of the recents list and similar.

[Unknowncat1991]

I cannot open ppsspp staring with this build :(

XRecorderLite_27032025_082351.mp4

pid: 13528, tid: 13552, name: RecentISOs  >>> org.ppsspp.ppsspp <<<

[03-27 08:20:10.482 14028:14028 F/DEBUG]
      #04 pc 000000000092ae10  /data/app/~~7ynrhkhFjuVUlvzJdB0PYg==/org.ppsspp.ppsspp-ldRjD0HKYggBw9mxVffgTA==/lib/arm64/libppsspp_jni.so (HandleAssert(char const*, char const*, int, char const*, char const*, ...)+388) (BuildId: c60042e40dc7b9bba2c914b5ade2a4302645fa06)

[03-27 08:20:10.482 14028:14028 F/DEBUG]
      #05 pc 000000000093a120  /data/app/~~7ynrhkhFjuVUlvzJdB0PYg==/org.ppsspp.ppsspp-ldRjD0HKYggBw9mxVffgTA==/lib/arm64/libppsspp_jni.so (getEnv()+112) (BuildId: c60042e40dc7b9bba2c914b5ade2a4302645fa06)

[03-27 08:20:10.482 14028:14028 F/DEBUG]
      #06 pc 00000000008c433c  /data/app/~~7ynrhkhFjuVUlvzJdB0PYg==/org.ppsspp.ppsspp-ldRjD0HKYggBw9mxVffgTA==/lib/arm64/libppsspp_jni.so (Android_FileExists(std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > const&)+32) (BuildId: c60042e40dc7b9bba2c914b5ade2a4302645fa06)

[03-27 08:20:10.482 14028:14028 F/DEBUG]
      #07 pc 00000000008ca79c  /data/app/~~7ynrhkhFjuVUlvzJdB0PYg==/org.ppsspp.ppsspp-ldRjD0HKYggBw9mxVffgTA==/lib/arm64/libppsspp_jni.so (File::Exists(Path const&)+108) (BuildId: c60042e40dc7b9bba2c914b5ade2a4302645fa06)

[03-27 08:20:10.482 14028:14028 F/DEBUG]
      #08 pc 0000000000748744  /data/app/~~7ynrhkhFjuVUlvzJdB0PYg==/org.ppsspp.ppsspp-ldRjD0HKYggBw9mxVffgTA==/lib/arm64/libppsspp_jni.so (RecentFilesManager::PerformCleanMissing()+272) (BuildId: c60042e40dc7b9bba2c914b5ade2a4302645fa06)

[03-27 08:20:10.482 14028:14028 F/DEBUG]
      #09 pc 0000000000747a38  /data/app/~~7ynrhkhFjuVUlvzJdB0PYg==/org.ppsspp.ppsspp-ldRjD0HKYggBw9mxVffgTA==/lib/arm64/libppsspp_jni.so (RecentFilesManager::ThreadFunc()+468) (BuildId: c60042e40dc7b9bba2c914b5ade2a4302645fa06)

[03-27 08:20:10.482 14028:14028 F/DEBUG]
      #10 pc 0000000000748f5c  /data/app/~~7ynrhkhFjuVUlvzJdB0PYg==/org.ppsspp.ppsspp-ldRjD0HKYggBw9mxVffgTA==/lib/arm64/libppsspp_jni.so (BuildId: c60042e40dc7b9bba2c914b5ade2a4302645fa06)

[03-27 08:20:10.736 944:944 I/BufferQueueDebug]
[SurfaceView[org.ppsspp.ppsspp/org.ppsspp.ppsspp.PpssppActivity](BLAST)#0](this:0xb4000076c650b8d0,id:-1,api:0,p:-1,c:944) onDestructor()

[03-27 08:20:10.737 944:944 I/BufferQueueDebug]
[SurfaceView[org.ppsspp.ppsspp/org.ppsspp.ppsspp.PpssppActivity](BLAST)#0](this:0xb4000077719808d0,id:-1,api:0,p:-1,c:944) onDestructor()

[03-27 08:20:10.738 944:944 I/BufferQueueDebug]
[org.ppsspp.ppsspp/org.ppsspp.ppsspp.PpssppActivity#0](this:0xb4000076c66658d0,id:-1,api:0,p:-1,c:944) onDestructor()

[03-27 08:20:10.740 944:944 I/BufferQueueDebug]
[SurfaceView[org.ppsspp.ppsspp/org.ppsspp.ppsspp.PpssppActivity](BLAST)#0](this:0xb4000076c66898d0,id:-1,api:0,p:-1,c:944) onDestructor()

[03-27 08:20:10.997 944:1093 E/BufferQueueDebug]
[Application Error: org.ppsspp.ppsspp#0](this:0xb4000076c12228d0,id:-1,api:0,p:-1,c:-1) id info cannot be read from 'Application Error: org.ppsspp.ppsspp#0'

[03-27 08:20:10.997 944:1093 I/BufferQueueDebug]
[Application Error: org.ppsspp.ppsspp#0](this:0xb4000076c12228d0,id:-1,api:0,p:-1,c:-1) BufferQueue core=(944:/system/bin/surfaceflinger)

[03-27 08:20:11.354 944:944 I/BufferQueueDebug]
[Application Error: org.ppsspp.ppsspp#0](this:0xb4000076c12228d0,id:-1,api:0,p:-1,c:944) onDestructor()

[hrydgard]

fix coming up