flatten modules to repo root, vendor deps, repair Eclipse build paths

Move api, engine, ui-console and ui-desktop out of modules/ up to the
repo root and drop the empty exception project (GuessMarketException now
lives in api).

Vendor gson, jaxb, okhttp, openjfx and tomcat under lib/, and group the
JUnit standalone jar into lib/junit/ alongside them.

Rewrite every .classpath: drop the copy-pasted optional="true" that was
masking real build path errors, point the library entries at ../lib/,
and put the JUnit jar on the test source folders so the placeholder
AppTest classes compile.

ui-desktop: take the JavaFX jars off the modulepath (there is no
module-info.java, so module="true" left the packages unresolvable) and
add a Launcher that calls Application.launch, avoiding the "JavaFX
runtime components are missing" check without VM arguments.

engine: add LocalGuessMarketService and the GuessMarketContext provider
interface, and give GuessMarketException the no-arg and cause
constructors they need.

1 files changed, 22 insertions, 0 deletions

diff --git a/ui-desktop/.classpath b/ui-desktop/.classpath
new file mode 100644
index 0000000..bac8826
--- /dev/null
+++ b/ui-desktop/.classpath
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+    <!-- Defines your source folder -->
+  <classpathentry kind="src" output="bin/classes" path="src/main/java"/> 
+  <classpathentry kind="src" output="bin/test-classes" path="src/test/java">
+    <attributes>
+      <attribute name="test" value="true"/>
+    </attributes>
+  </classpathentry>
+    <!-- Defines the standard Java System Library -->
+    <classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
+    <!-- Defines where compiled .class files go -->
+  <classpathentry kind="output" path="bin"/>    
+
+  <classpathentry kind="lib" path="../lib/junit/junit-platform-console-standalone-6.1.1.jar"/>
+  <!-- Required OpenJFX JARs explicitly placed on the Modulepath -->
+  <classpathentry kind="lib" path="../lib/openjfx/javafx.base.jar"/>
+  <classpathentry kind="lib" path="../lib/openjfx/javafx.controls.jar"/>
+  <classpathentry kind="lib" path="../lib/openjfx/javafx.graphics.jar"/>
+  <classpathentry kind="lib" path="../lib/openjfx/javafx.fxml.jar"/>
+</classpath>
+