simple sd_save flag ...

something that allows you to decide which title to redirect games saves and which does not

Do same in ams_mitm

stratosphere: TODO: panic -> std::abort()

fs.mitm: Implement FileStorage

ams: improve fatal error context

stratosphere: only hold sm sessions open when needed

fs.mitm: fix data abort

pm: on 7.0.0+, npns is launched in maintenance boot (closes #511)

stratosphere: custom exception handlers (reboot to fusee)

atmosphere: current year is 2019

Merge remote-tracking branch 'origin/master'

fs.mitm: experimental support for save redirection to sd.

fs_mitm/fs_dir_utils: Amend logic error within IterateDirectoryRecursivelyInternal() (#498) ...

This likely intended to get the size of the string and then subtract the
null terminator byte. Instead, this would always result in a sizeof of
8.

fs.mitm: fix logic error in CopyFile

strat: sha256 s/linux/libnx/g

bis_protect: guard against autorcm on rcm-patched units

set_mitm: result defs instead of magics

strat: 0 -> ResultSuccess

strat: use TitleId defs instead of magics.

strat: use atmosphere results instead of magics

strat: fix remaining FS result magic numbers

strat: replace kernel/dbg magic numbers with result defs

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)