Rename spring-boot-loader to spring-boot-loader-classic

Rename the `spring-boot-loader` module to `spring-boot-loader-classic`
so that we can introduce an alternative loader implementation.

See gh-37669

spring-boot-project/spring-boot-tools/spring-boot-loader-classic/src/test/resources/BOOT-INF/classes/application.properties

@@ -0,0 +1 @@
+loader.main: demo.Application

spring-boot-project/spring-boot-tools/spring-boot-loader-classic/src/test/resources/BOOT-INF/classes/bar.properties

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+loader.main: my.BootInfBarApplication

spring-boot-project/spring-boot-tools/spring-boot-loader-classic/src/test/resources/BOOT-INF/classes/foo.properties

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+foo: Application
+loader.main: my.${foo}
+loader.path: etc

spring-boot-project/spring-boot-tools/spring-boot-loader-classic/src/test/resources/BOOT-INF/classes/loader.properties

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+loader.main: demo.Application

spring-boot-project/spring-boot-tools/spring-boot-loader-classic/src/test/resources/META-INF/spring.factories

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+# Jar Modes
+org.springframework.boot.loader.jarmode.JarMode=\
+org.springframework.boot.loader.jarmode.TestJarMode

spring-boot-project/spring-boot-tools/spring-boot-loader-classic/src/test/resources/bar.properties

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+loader.main: my.BarApplication

spring-boot-project/spring-boot-tools/spring-boot-loader-classic/src/test/resources/explodedsample/ExampleClass.txt

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+/*
+ * Copyright 2012-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package explodedsample;
+
+/**
+ * Example class used to test class loading.
+ *
+ * @author Phillip Webb
+ */
+public class ExampleClass {
+
+}

spring-boot-project/spring-boot-tools/spring-boot-loader-classic/src/test/resources/home/loader.properties

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+loader.main: demo.HomeApplication

spring-boot-project/spring-boot-tools/spring-boot-loader-classic/src/test/resources/org/springframework/boot/loader/classpath-index-file.idx

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+- "BOOT-INF/layers/one/lib/a.jar"
+- "BOOT-INF/layers/one/lib/b.jar"
+- "BOOT-INF/layers/one/lib/c.jar"
+- "BOOT-INF/layers/two/lib/d.jar"
+- "BOOT-INF/layers/two/lib/e.jar"

spring-boot-project/spring-boot-tools/spring-boot-loader-classic/src/test/resources/placeholders/META-INF/MANIFEST.MF

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+Manifest-Version: 1.0
+Start-Class: ${foo.main}

spring-boot-project/spring-boot-tools/spring-boot-loader-classic/src/test/resources/placeholders/loader.properties

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+foo.main: demo.FooApplication

spring-boot-project/spring-boot-tools/spring-boot-loader-classic/src/test/resources/root/META-INF/MANIFEST.MF

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+

spring-boot-project/spring-boot-tools/spring-boot-loader-classic/src/test/resources/root/META-INF/spring/application.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<beans xmlns="http://www.springframework.org/schema/beans"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
+
+</beans>