Publish to Bintray using maven-publish

[cortinico]

Moving Detekt to use only maven-publish for publishing and removing gradle-bintray-plugin.

I think this simplifies overall our setup having a couple of benefits:

• We publish the .module files.
• We publish the .md5 files computed locally (partial fix for Sign artifacts and publish checksums #2883)

There a couple of drawbacks:

1. Unfortunately due to Gradle 6.0 generates incorrect versions for Kotlin multiplatform projects when publishing to Bintray gradle/gradle#11412 I had to systemProp.org.gradle.internal.publish.checksums.insecure=true. That would have allowed us to publish also locally computed SHA512 for free. This unfortunately confuses Bintray that we're releasing a new version for every module, that is really annoying.

2. @arturbosch you now need to manually start the Maven Central sync. If needed we can have a Gradle task that hits an HTTP endpoint to start the sync. Otherwise this has to be done manually from the Bintray UI.

Here a sample publishing:
https://bintray.com/cortinico/maven/detekt-sample-publishing/

Fixes #2878

[cortinico]

We could set publish=0 to prevent publishing of a new version from Bintray. Then @arturbosch you would have to manually publish the artifacts from Bintray (this allows to verify the deployment before publishing, maybe it's useful?)

[codecov]

Codecov Report

Merging #2885 into master will increase coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #2885      +/-   ##
============================================
+ Coverage     80.13%   80.18%   +0.04%     
  Complexity     2414     2414              
============================================
  Files           421      421              
  Lines          7355     7357       +2     
  Branches       1342     1342              
============================================
+ Hits           5894     5899       +5     
+ Misses          764      762       -2     
+ Partials        697      696       -1     

Impacted Files	Coverage Δ	Complexity Δ
...itlab/arturbosch/detekt/api/internal/YamlConfig.kt	84.61% <0.00%> (+3.84%)	9.00% <0.00%> (ø%)
...n/kotlin/io/gitlab/arturbosch/detekt/api/Config.kt	100.00% <0.00%> (+13.33%)	0.00% <0.00%> (ø%)

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[cortinico]

@arturbosch was this working correctly for 1.11.0-RC?

[arturbosch]

Yep, so many files but works greatly! : D Thanks.