Replace deployer with a simpler library

Instead of an app, it is now a library with some utilities
(principally ApplicationBootstrap) for launching a Spring Boot
application, extracting a function, and registering it in the
FunctionRegistry.

spring-cloud-function-deployer/src/it/settings.xml

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<settings>
+	<profiles>
+		<profile>
+			<id>it-repo</id>
+			<activation>
+				<activeByDefault>true</activeByDefault>
+			</activation>
+			<repositories>
+				<repository>
+					<id>local.central</id>
+					<url>@localRepositoryUrl@</url>
+					<releases>
+						<enabled>true</enabled>
+					</releases>
+					<snapshots>
+						<enabled>true</enabled>
+					</snapshots>
+				</repository>
+			</repositories>
+			<pluginRepositories>
+				<pluginRepository>
+					<id>local.central</id>
+					<url>@localRepositoryUrl@</url>
+					<releases>
+						<enabled>true</enabled>
+					</releases>
+					<snapshots>
+						<enabled>true</enabled>
+					</snapshots>
+				</pluginRepository>
+			</pluginRepositories>
+		</profile>
+	</profiles>
+</settings>