fix InvokeAI download URLs (invoke-ai#1910)

- This fixes the .bat and .sh file URLs for the InvokeAI source
  code.

Simple Installer for Unified Directory Structure, Initial Implementat…

…ion (invoke-ai#1819)

* partially working simple installer

* works on linux

* fix linux requirements files

* read root environment variable in right place

* fix cat invokeai.init in test workflows

* fix classical cp error in test-invoke-pip.yml

* respect --root argument now

* untested bat installers added

* windows install.bat now working

fix logic to find frontend files

* rename simple_install to "installer"

1. simple_install => 'installer'
2. source and binary install directories are removed

* enable update scripts to update requirements

- Also pin requirements to known working commits.
- This may be a breaking change; exercise with caution
- No functional testing performed yet!

* update docs and installation requirements

NOTE: This may be a breaking commit! Due to the way the installer
works, I have to push to a public branch in order to do full end-to-end
testing.

- Updated installation docs, removing binary and source installers and
  substituting the "simple" unified installer.
- Pin requirements for the "http:" downloads to known working commits.
- Removed as much as possible the invoke-ai forks of others' repos.

* fix directory path for installer

* correct requirement/environment errors

* exclude zip files in .gitignore

* possible fix for dockerbuild

* ready for torture testing

- final Windows bat file tweaks
- copy environments-and-requirements to the runtime directory so that
  the `update.sh` script can run.

  This is not ideal, since we lose control over the
  requirements. Better for the update script to pull the proper
  updated requirements script from the repository.

* allow update.sh/update.bat to install arbitrary InvokeAI versions

- Can pass the zip file path to any InvokeAI release, branch, commit or tag,
  and the installer will try to install it.
- Updated documentation
- Added Linux Python install hints.

* use binary installer's :err_exit function

* user diffusers 0.10.0

* added logic for CPPFLAGS on mac

* improve windows install documentation

- added information on a couple of gotchas I experienced during
  windows installation, including DLL loading errors experienced
  when Visual Studio C++ Redistributable was not present.

* tagged to pull from 2.2.4-rc1

- also fix error of shell window closing immediately if suitable
  python not found

Co-authored-by: mauwii <Mauwii@outlook.de>

Reduce more memories on free_gpu_mem option (invoke-ai#1915)

* Enhance free_gpu_mem option
Unload cond_stage_model on free_gpu_mem option is setted

* Enhance free_gpu_mem option
Unload cond_stage_model on free_gpu_mem option is setted

add compiled windows file

moving tag so that download links point to right place

fix basicsr conflict on windows

fix regression in copy function

recompile for linux

change download links to release candidate

Merge branch 'main' into source-installer-improvements