cs: implement GetFirmwareVersion command

scs: implement EventHandlerThread for shell

scs: implement DoShellServer

LogManager: implement system module, client api, logging api (#1617) ...

Some notes:

* Unless `atmosphere!enable_log_manager` is true, Nintendo's log manager will be used instead.
  * This prevents paying memory costs for LM when not enabling logging.
  * To facilitate this, Atmosphere's log manager has a different program id from Nintendo's.
  * `atmosphere!enable_htc` implies `atmosphere!enable_log_manager`.
* LogManager logs to tma, and the SD card (if `lm!enable_sd_card_logging` is true, which it is by default).
* Binary logs are saved to `lm!sd_card_log_output_directory`, which is `atmosphere/binlogs` by default.

Add arguments support to Daybreak (#1616) ...

* Add arguments support to Daybreak

* Check if Daybreak is run as NRO

build: fix building with directory existing

fusee: fix log_inverted flag parse

fusee: fix prodinfo blanking flag detection for sysmmc (closes #1610)

git subrepo push libraries ...

subrepo:
  subdir:   "libraries"
  merged:   "0c0bb815"
upstream:
  origin:   "https://github.com/Atmosphere-NX/Atmosphere-libs"
  branch:   "master"
  commit:   "0c0bb815"
git-subrepo:
  version:  "0.4.1"
  origin:   "???"
  commit:   "???"

docs: mention custom splash script in changelog ...

Also, bring commit count for the fusee_cpp PR to a nice point before merging.

utils: add script for inserting custom image into package3

ams: docs/build update

fusee: accept spaces inside ini values (we still left/right strip)

fusee: add package3 magic

fusee: accept ini files without empty line at end

fusee: attempt reboot to self if possible, better abort/fatal handlers

package3: fix hekate compatibility (use real sizes)

build: fix clean target

stratosphere: remove 0.19.0 update cleanup logic.

fusee: remove TODO comments in buildscript

fusee: fix buildsystem, rename secondary -> package3

fusee: tactically don't trash PLLA1, fixes audio corruption on boot

patches: nogc patches now embedded in fusee rather than being .ips

config: BCT.ini no longer exists

ams-1.0.0: bump version number well ahead of time

fusee_cpp: rename source dir to fusee

fusee: delete fusee (this will break build temporarily)

ams-1.0.0: meso no longer optional, remove conditional logic

fusee_cpp: improve/fix file-based emummc

fusee: fix sd card size detection for emummc