GP-1981 - Updated help to allow authors to use theme image ids; updated

help to only allow modules that live on the classpath. Dpdating themd
documentation. Fixing gradle help build

gradle/helpProject.gradle

@@ -70,11 +70,11 @@ task indexHelp(type: JavaExec) {
 	group "private"
 	description "indexes the helps files for this module.  [gradle/helpProject.gradle]"
 
-
 	File helpRootDir = file('src/main/help/help')		
 	File outputFile = file("build/help/main/help/${project.name}_JavaHelpSearch")	
 
 	dependsOn configurations.helpPath
+	dependsOn configurations.runtimeClasspath
 
 	inputs.dir helpRootDir
 	outputs.dir outputFile
@@ -132,12 +132,18 @@ task buildHelp(type: JavaExec, dependsOn: indexHelp) {
 	group rootProject.GHIDRA_GROUP
 	description "      Builds the help for this module.  [gradle/helpProject.gradle]\n"	
 
-	outputs.upToDateWhen {false}
+	outputs.upToDateWhen {false} // TODO remove this. we should be able to get the inputs right
+								// the issue is if docs get changed in a dependant module,
+								// this modules needs to know to rebuild
 
 	File helpRootDir = file('src/main/help/help')	
 	File outputDir = file('build/help/main/help')
 
-	inputs.dir helpRootDir
+	inputs.dir file('src/main/help');
+	File resourcesDir = file('src/main/resources')
+	if (resourcesDir.exists()) {
+		inputs.dir file('src/main/resources');
+	}
 	outputs.dir outputDir
 
 	mainClass = 'help.GHelpBuilder'
@@ -150,8 +156,15 @@ task buildHelp(type: JavaExec, dependsOn: indexHelp) {
 	// args '-debug' // print debug info
 
 	doFirst {		
-		// this modules runtime classpath (contains jhall.jar)
-		classpath project(':Help').sourceSets.main.runtimeClasspath		
+	
+		// this module's runtime classpath (contains jhall.jar)
+		classpath project(':Help').sourceSets.main.runtimeClasspath
+		
+		// include the classpath for the project using this Help gradle script plugin    
+    	classpath += project.sourceSets.main.runtimeClasspath	
+		// since this runs BEFORE resources are copied, include the resources source dir in
+		// the classpath so the help validator can find them
+		classpath += files('src/main/resources')
 	
 		configurations.helpPath.each { 
 			args "-hp"