fix silly attempts to get rid of errors during compilation and put the missing import-package in place, otherwise it obviously cannot work

eclipse-language-servers/org.springframework.tooling.boot.ls/META-INF/MANIFEST.MF

@@ -28,6 +28,7 @@ Require-Bundle: org.eclipse.jdt.launching;bundle-version="3.9.0",
  org.eclipse.wst.sse.ui;bundle-version="1.5.0";resolution:=optional,
  org.json;bundle-version="1.0.0"
 Import-Package: com.google.common.base,
+ com.google.common.collect,
  com.google.gson;version="2.7.0",
  org.eclipse.jface.preference,
  org.osgi.framework

eclipse-language-servers/org.springframework.tooling.boot.ls/pom.xml

@@ -18,15 +18,6 @@
 	<build>
 		<plugins>
 
-			<plugin>
-				<groupId>org.eclipse.tycho</groupId>
-				<artifactId>tycho-compiler-plugin</artifactId>
-				<version>${tycho-version}</version>
-				<configuration>
-					<compilerArgument>-warn:+discouraged,forbidden</compilerArgument>
-				</configuration>
-			</plugin>
-
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-dependency-plugin</artifactId>
@@ -86,6 +77,7 @@
 			</plugin>
 
 		</plugins>
+
 	</build>
 
 </project>

eclipse-language-servers/org.springframework.tooling.boot.ls/src/org/springframework/tooling/boot/ls/DelegatingStreamConnectionProvider.java

@@ -52,7 +52,6 @@ import com.google.common.collect.ImmutableSet;
  * 
  * @author Martin Lippert
  */
-@SuppressWarnings("restriction")
 public class DelegatingStreamConnectionProvider implements StreamConnectionProvider {
 
 	private StreamConnectionProvider provider;

eclipse-language-servers/org.springframework.tooling.boot.ls/src/org/springframework/tooling/boot/ls/prefs/RemoteAppsPrefs.java

@@ -27,7 +27,6 @@ import org.springsource.ide.eclipse.commons.livexp.util.Log;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableList.Builder;
 
-@SuppressWarnings("restriction")
 public class RemoteAppsPrefs {
 
 	public static final String REMOTE_APPS_KEY = "remote-apps";

eclipse-language-servers/org.springframework.tooling.boot.ls/src/org/springframework/tooling/boot/ls/prefs/RemoteAppsPrefsPage.java

@@ -18,7 +18,6 @@ import org.springsource.ide.eclipse.commons.livexp.ui.PrefsPageSection;
 
 import com.google.common.collect.ImmutableList;
 
-@SuppressWarnings("restriction")
 public class RemoteAppsPrefsPage extends PreferencePageWithSections {
 
 	public static final String PREF_REMOTE_BOOT_APPS_JSON = "boot-java.remote-apps";