Apply java-library plugin to published libraries

apps/ministreaming/build.gradle

+apply plugin: 'java-library'
+
 archivesBaseName = 'mstreaming'
 
 sourceSets {
@@ -14,7 +16,7 @@ sourceSets {
 }
 
 dependencies {
-    compile project(':core')
+    api project(':core')
 }
 
 configurations {

apps/streaming/build.gradle

+apply plugin: 'java-library'
+
 sourceSets {
     main {
         java {
@@ -12,7 +14,7 @@ sourceSets {
 }
 
 dependencies {
-    compile project(':core')
-    compile project(':apps:ministreaming')
-    testCompile project(path: ':apps:ministreaming', configuration: 'tests')
+    api project(':core')
+    api project(':apps:ministreaming')
+    testImplementation project(path: ':apps:ministreaming', configuration: 'tests')
 }

core/build.gradle

+apply plugin: 'java-library'
+
 archivesBaseName = 'i2p'
 
 sourceSets {

router/build.gradle

+apply plugin: 'java-library'
+
 sourceSets {
     main {
         java {
@@ -12,8 +14,8 @@ sourceSets {
 }
 
 dependencies {
-    compile project(':core')
-    testCompile project(path: ':core', configuration: 'tests')
+    api project(':core')
+    testImplementation project(path: ':core', configuration: 'tests')
 }
 
 jar {