Revise docs for 3.0.0-alpha.3 (winsw#608)

* Mention optional settings

* Mention removed settings

* Add links to system requirements

* markdownlint fixes

* Remove trailing spaces

* Mention boolean elements

* Add preshutdown

* Add `dev ps` command

* Stop misleading

* Why aren't you using Windows 10?

* Add `stdoutPath`/`stderrPath`

* Relative paths and the default working directory

* Send a close message to Windows (GUI) apps

* Use valid XML

* Add `customize` and `dev kill` commands

* Update README.md

* Add commands

* Fix spacing

* Update installation.md

* Update README.md

Revise docs for 3.0.0-alpha.2 (winsw#594)

* Update links

* Remove `<waithint>` and `<sleeptime>`

* Create cli-commands.md

* Update migrate-to-3-x.md

* Update the Usage section

* Fix broken link

* Add `--force` to `stop` and `restart`

* CAUTION

* WIP Add extra steps

* Split removals

* Update additional commands

* Update cli-commands.md

* Update README.md

* Update README.md

* NOTE

* Update copyright texts

* Temporarily skip failing test

* Suggest using command-line options

Revise docs for 3.0.0-alpha.1 (winsw#587)

* Add pre-release badge

* Update XML spec for `<username>`

* Update exit codes

* Update XML spec for `<prompt>`

* Create migration guide

* Add a note for the previous version

* docs -> documentation

* * Format usage

* Talk to myself

* * Add deployment status badge

* Update version strings

* Update README title

* Link to the migration guide

* * Remove .NET Core version number

* Delete exe-config-file.md

* Update README.md

* migration-guide.md -> migrate-to-3-x.md

Merge pull request winsw#341 from new-mikha/master

Add stopwait command - same as stop, but waits until the service is actually stopped:

Prompt for elevation (winsw#457)

* Prompt for elevation

* Add error messages for interop errors

* Assume process is elevated on Windows XP

Co-authored-by: Oleg Nenashev <o.v.nenashev@gmail.com>

Merge pull request winsw#474 from NextTurn/accounts

Document special accounts and the default domain

Merge pull request winsw#420 from NextTurn/cli

Revert CLI behaviors in non-interactive mode

Merge pull request winsw#414 from NextTurn/mmi

Disable MMI

Merge pull request winsw#407 from NextTurn/license

Update license

Merge pull request winsw#393 from NextTurn/envvar

Potentially fix RunawayProcessKillerTest