[Enhancement] Add allChecksAsErrors and override by disabling some after what you don’t want.

[alexandrenavarro]

[Enhancement] Add allChecksAsErrors and override by disabling some after what you don’t want.

I will explain what I did today in my different projects with errorprone checks.

Today, I consider I should use a maximum of errorprone checks because in my experience on my different projects where I recently used errorprone, around 98-99% of the checks of errorprone are good.

So in my gradle build,  I added some configuration generated by this magnificent commandline
curl [https://errorprone.info/bugpatterns|grep](https://errorprone.info/bugpatterns%7Cgrep) "bugpattern"| awk -F'[/\"]' ' {print "error(\"" $3 "\")" }'

After, at first in any project, I just disable all the checks where I have an error
and in a second time, I reactivate a check and examine the different violation to determine

1. if I should fix directly or by configuring some options and fix it

2. if I should disable it because I don't consider it is not a really good practise notably on some controversial checks,

3. if I can't fix it (so I disable it) because  

   3.1. there are some false positives I can't fix by modifying code or configuring some options 
   3.2. it does not depend on me but a third library I used not well coded.

The majority is clearly 1 at the end.

I saw some people using -Werror but I don't want to use it because I have some warnings not generated by errorprone in my build and I don't want to fix at the same time like some @Deprecated methods.

Adding this feature is "a nice to have" but not a blocker issue because what I do works but I need to add a lot of boilerplate configuration in my gradle. 
I will commonize some configuration in a gradle plugin for all my projects to reduce the boilerplate configuration.
I understand not to activate by default all the checks but with this kind of option and of course if you can disable / warn by overriding the configuration on a check and if you know what you want to do, I think it should be a nice feature and personally I like to use erroprone with this approach.

Don't hesitate if you have some questions or any comments, thank you for your amazing checker.