stratosphere: migrate result headers to libstrat

fs.mitm: fix missing include in fs_shim.c

fs.mitm: Implement DirectorySaveDataFileSystem.

ams_mitm: fix erroneous comment due to copy-paste.

fs.mitm: prefer official web content to hbl_html

ams_mitm: add ns:web mitm for HBL web support

fs.mitm: fix some filesystem issues

set.mitm: fix 1.0.0 compat (closes #459)

fs.mitm: also give choinx access to boot1 (closes #485)

fs.mitm: make HBL web content work (verified on hw)

fs.mitm: fix error in FsPathUtils::VerifyPath

fs.mitm: fix null deref

fs.mitm: Add Hbl Web override support, also support choinx"

fs.mitm: Implement path normalization

fs.mitm: Implement SubDirectoryFileSystem

fs.mitm: ProxyFile, ProxyDirectory, ProxyFileSystem

fs.mitm: implement ifilesystem wrapper

fs.mitm: fix inverted ifile condition

fs.mitm: start implementation of IFileSystem api.

hbl: change default to every_app=true, change default override key

loader: separate override_any_app (deprecate =app)

loader/ams_mitm: Change Down -> Held in API

loader/ams_mitm: hidKeysHeld, not hidKeysDown (and remove workaround)

fs_mitm: Fix mismatched new[] / delete (#389) ...

* fs.mitm: Fix mismatched new[] / delete

Using delete instead of delete[] on a pointer given by new[] is
undefined behaviour.

For memory sources, malloc/free are used because cleaning up is tricky
when data can be either allocated with new (RomfsHeader) or new[]
(metadata).

* set.mitm: Fix mismatched new[] / delete

fs.mitm: fix two cases of inverted logic

stratosphere: fix svcExitThread usage

fs.mitm: make prodinfo backups actually work

dmnt: allow disabling cheats via title-specific button combo

fs.mitm: fix inverted conditional

fs.mitm: Add title-specific override key support.