Remove ignored lint rules (#4621)

We don't do anything about these ones, and they just clutter the logs making important stuff much harder to find (as agreed in #2823 and #4077).

We already use IntelliJ's inspections feature to replace the need for this.

app/build.gradle

@@ -7,7 +7,6 @@ apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-kapt'
 apply plugin: 'kotlin-android-extensions'
 apply plugin: "com.hiya.jacoco-android"
-apply from: 'quality.gradle'
 
 def isRunningOnTravisAndIsNotPRBuild = System.getenv("CI") == "true" && file('../play.p12').exists()
 

app/quality.gradle

@@ -1,45 +0,0 @@
-apply plugin: 'checkstyle'
-apply plugin: 'pmd'
-
-check.dependsOn 'checkstyle', 'pmd'
-
-checkstyle {
-    toolVersion = '7.5.1'
-}
-
-task checkstyle(type: Checkstyle) {
-    configFile file("${project.rootDir}/script/style/checkstyle.xml")
-    source 'src'
-    include '**/*.java'
-    exclude '**/gen/**'
-
-    classpath = files()
-
-    reports {
-        html {
-            enabled true
-            destination file("${project.buildDir}/reports/checkstyle/checkstyle.html")
-        }
-    }
-}
-
-task pmd(type: Pmd) {
-    ignoreFailures = true
-    ruleSetFiles = files("${project.rootDir}/script/style/ruleset.xml")
-    ruleSets = []
-
-    source 'src'
-    include '**/*.java'
-    exclude '**/gen/**'
-
-    reports {
-        xml.enabled = false
-        html.enabled = true
-        xml {
-            destination file("${project.buildDir}/reports/pmd/pmd.xml")
-        }
-        html {
-            destination file("${project.buildDir}/reports/pmd/pmd.html")
-        }
-    }
-}