More work on API plus basic block explorer

Added FATJAR packaging support to pom.xml

Added some "summary" fields to API calls but more need doing.
Corrected path clash from having unnecessary @OpenAPIDefinition annotations.
Added API "tags" to group similar calls (address-based, block-related, etc.)
Fixed addresses/lastreference/{address}
Implemented addresses/lastreference/{address}/unconfirmed
Implemented addresses/assets/{address}
Added /admin/stop and /admin/uptime API calls.
Moved general API info into new src/api/ApiDefinition.java
Added CORS support to ApiService
Added /transactions/address/{address} and /transactions/block/{signature}

Replaced references to test.Common.* to do with repository factory.
 This fixes issues with building FATJAR due to references to test classes
 that are omitted from FATJAR.

Changes to AccountBalanceData, BlockData and TransactionData
 to support JAX-RS rendering to JSON.

Added getUnconfirmedLastReference() to Account.

Added getAllBalances(address) to account repository
 - returns all asset balances for that address.

Added getAllSignaturesInvolvingAddress(address) to account repository
 but currently only uses TransactionRecipients HSQLDB table.
 (And even that wasn't automatically populated).

Included: very basic block explorer to be opened in browser as a file:
block-explorer.html

pom.xml

@@ -5,6 +5,7 @@
 	<artifactId>qora-core</artifactId>
 	<version>2.0.0-SNAPSHOT</version>
 	<properties>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<swagger-ui.version>3.19.0</swagger-ui.version>
 	</properties>
 	<build>
@@ -19,6 +20,36 @@
 					<target>1.8</target>
 				</configuration>
 			</plugin>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-assembly-plugin</artifactId>
+				<executions>
+					<execution>
+						<phase>package</phase>
+						<goals>
+							<goal>single</goal>
+						</goals>
+						<configuration>
+							<archive>
+								<manifest>
+									<mainClass>
+										Start
+									</mainClass>
+									<addClasspath>true</addClasspath>
+								</manifest>
+								<manifestEntries>
+									<Class-Path>. ..</Class-Path>
+								</manifestEntries>
+							</archive>
+							<descriptorRefs>
+								<descriptorRef>jar-with-dependencies</descriptorRef>
+							</descriptorRefs>
+							<finalName>Qora</finalName>
+							<appendAssemblyId>false</appendAssemblyId>
+						</configuration>
+					</execution>
+				</executions>
+			</plugin>
 			<!-- unpack swagger-ui to target folder -->
 			<plugin>
 				<artifactId>maven-dependency-plugin</artifactId>
@@ -42,7 +73,7 @@
 					</execution>
 				</executions>
 			</plugin>
-			<!-- inject correct url to swagger json file into swwagger-ui -->
+			<!-- inject correct url to swagger json file into swagger-ui -->
 			<plugin>
 				<groupId>com.google.code.maven-replacer-plugin</groupId>
 				<artifactId>replacer</artifactId>
@@ -154,6 +185,12 @@
 			<version>9.4.11.v20180605</version>
 			<type>jar</type>
 		</dependency>
+		<!-- https://mvnrepository.com/artifact/org.eclipse.jetty/jetty-servlets -->
+		<dependency>
+			<groupId>org.eclipse.jetty</groupId>
+			<artifactId>jetty-servlets</artifactId>
+			<version>9.4.11.v20180605</version>
+		</dependency>
 		<dependency>
 			<groupId>org.glassfish.jersey.inject</groupId>
 			<artifactId>jersey-hk2</artifactId>