Move modules to independent build files

The main `build.gradle` file contains now only the common build
infrastructure; all module-specific build configurations have
been moved to their own build file.

Issue: SPR-15885

spring-orm/spring-orm.gradle

@@ -0,0 +1,17 @@
+description = "Spring Object/Relational Mapping"
+
+dependencies {
+	compile(project(":spring-beans"))
+	compile(project(":spring-core"))
+	compile(project(":spring-jdbc"))
+	compile(project(":spring-tx"))
+	optional(project(":spring-aop"))
+	optional(project(":spring-context"))
+	optional(project(":spring-web"))
+	optional("org.eclipse.persistence:org.eclipse.persistence.jpa:2.7.0-RC3")
+	optional("org.hibernate:hibernate-core:5.2.10.Final")
+	optional("javax.servlet:javax.servlet-api:3.1.0")
+	testCompile("org.aspectj:aspectjweaver:${aspectjVersion}")
+	testCompile("org.hsqldb:hsqldb:${hsqldbVersion}")
+	testRuntime("javax.xml.bind:jaxb-api:${jaxbVersion}")
+}