use paket as dotnet cli tools and upgrade fake

[lust4life]

• https://github.com/enricosada/paket-netcore-testing-as-tool
• Full netcore fsprojects/Paket#3183
• https://fake.build/fake-migrate-to-fake-5.html

update paket

• use paket as netcore tools (no need mono)
• use paket framework auto-detect to handle targetframeworks in project files
• use storage none to avoid create local copies
• remove .paket/load/*

update fake

• migrate to fake 5

[lust4life]

@haf ci passed 😀

[haf]

Yey! Nicely done.