fixed various fixer issues

[sio4]

Fixed various fixer issues:

• fixed yarn install error on berry enabled tree
  • related to Remove unsupported yarn install option. Default to use Yarn berry #96
• fixed "Error: open main.go" error when fixing recent versions
  • made deprecations fix to use new structure
  • moved structural fixes to the beginning of the fix sequence
• moved Refresh() into the movemain.go file (related fixes)
• added related test case (TestFix_Self: run fix against a new app)
• misc fixes: removing space, get y/n answer in the same line
• version bump (to 0.18.6)

error message for the location of main.go (deprecations):

~~~ Checking for deprecations ~~~
<...>
time="2022-05-27T20:06:03+09:00" level=error msg="Error: open main.go: no such file or directory"

error message for the yarn install issue:

~~~ Checking package.json ~~~
Unknown Syntax Error: Unsupported option name ("--no-progress").

[paganotoni]

This LGTM. Thanks for the fixes. One note on Yarn. I've seen that even when my repo uses npm yarn gets invoked. Will open an issue with it.