Add version enums for 20.1.0

docs: add banner to readme

git subrepo push libraries ...

subrepo:
  subdir:   "libraries"
  merged:   "9e8cbe3fa"
upstream:
  origin:   "https://github.com/Atmosphere-NX/Atmosphere-libs"
  branch:   "master"
  commit:   "9e8cbe3fa"
git-subrepo:
  version:  "0.4.1"
  origin:   "???"
  commit:   "???"

svc: bump supported kernel version

git subrepo push emummc ...

subrepo:
  subdir:   "emummc"
  merged:   "7522f1f60"
upstream:
  origin:   "https://github.com/m4xw/emummc"
  branch:   "develop"
  commit:   "7522f1f60"
git-subrepo:
  version:  "0.4.1"
  origin:   "???"
  commit:   "???"

fusee: commit mtc table combined bins, to remove need for running py script outside of makefile

boot: use --embed-dir for fusee embed

pm: update for fsp-pr RegisterProgram api change

docs: add gcc15 to changelog

boot: use #embed for fusee

exo: use #embed for loader stub

fusee: use embed in mtc/sdram param scripts

ams: basic support for compiling with gcc 15

fusee: fix off-by-one in nogc patches for exFAT firm

docs: add provisional changelog for ams 1.9.0

fs.mitm: add and use memlet module to temporarily steal applet memory while building romfs images. ...

Starting in 20.0.0, the browser needs more applet memory to function, so we can't steal as much any more.
Thus, we now steal 14 MB on 20.0.0+ instead of 40MB.

However, since this reduces memory available for custom system modules, we are adjusting to compensate.
ams.mitm's heap size has been reduced from 32MB to 12MB (recovering 20MB).
In addition, fs.mitm now uses a new mechanism for stealing memory from the applet pool while romfs is being built.

On net, we are compromising:
    * Custom sysmodules lose memory available to them.
        On 19.0.0/AMS 1.8.0, there was 30 MB available for custom sysmodules.
        Stealing 14 MB instead of 40 MB, we lose 26 MB of that. Reducing ams.mitm's usage will gain us back 20.
        Nintendo also appears to...use 4 extra MB, in 20.0.0, from my test homebrew.
        So on 20.0.0/AMS 1.9.0, there should be 20 MB available for custom sysmodules.
        On the bright side, on <20.0.0/AMS 1.9.0, I guess there will be 50 MB available for custom sysmodules now?
    * totk mods will lose the ability to...put every file in the romfs on sd card. There will be some unknown maximum filecount for totk mods.
        On the bright side, implementing the transient memory stealing should improve compatibility for some mods which strictly add files?

emummc: fix offsets for 20.0.0-exfat

ams: add enum support for 20.0.1/18.0.1

erpt: initial support (incomplete) for 20.0.0

ldr/pm: update for 20.0.0 abi changes

strat: update for fsp-ldr 20.0.0 changes

ncm: update to implement new ContentMetaDatabase function for 20.0.0

kern: plutoo is an intellectual, I am a fool, fix chicanery

kern: use callback to note pte updates in KPageTableImpl

kern: refactor FindFreeArea region search logic per 20.0.0 changes

kern: update instruction cache invalidation logic in KPageTableBase to reflect 20.0.0 changes

kern: reorder resource manager implementation

kern: support null resource limit in KSecureSystemResource

kern: update synchronous exception handlers to assume FAR validity on TLB conflict

kern: adjust system registers during exception handling on MTE-violation or kernel address fault