Simplify and cleanup the build process

- Garbage collect unused ant and shell scripts.
- Garbage collect unused checked-in jars.
- Avoid creating nested  within jars as much as possible.

UI/org.eclipse.birt.report.designer.tests/META-INF/MANIFEST.MF

@@ -39,5 +39,5 @@ Require-Bundle: org.eclipse.core.runtime;bundle-version="[3.2.0,4.0.0)",
  org.eclipse.birt.report.designer.ui.views;bundle-version="4.13.0"
 Bundle-ActivationPolicy: lazy
 Bundle-RequiredExecutionEnvironment: JavaSE-11
-Bundle-ClassPath: designertests.jar
+Bundle-ClassPath: .
 Automatic-Module-Name: org.eclipse.birt.report.designer.tests

UI/org.eclipse.birt.report.designer.tests/build.properties

@@ -13,13 +13,12 @@
 bin.includes = .,\
                META-INF/,\
                about.html,\
-               designertests.jar,\
                plugin.xml,\
                test.xml,\
                icon/,\
                OSGI-INF/l10n/bundle.properties,\
                OSGI-INF/
-output.designertests.jar = target/classes/
-source.designertests.jar = test/,\
-                           src/
+output.. = target/classes/
+source.. = test/,\
+           src/
 src.includes = about.html

UI/org.eclipse.birt.report.designer.ui.data/META-INF/MANIFEST.MF

@@ -25,6 +25,5 @@ Export-Package: org.eclipse.birt.report.designer.data.ui.actions,
  org.eclipse.birt.report.designer.data.ui.datasource,
  org.eclipse.birt.report.designer.data.ui.providers,
  org.eclipse.birt.report.designer.data.ui.util
-Bundle-ClassPath: library.jar,
- .
+Bundle-ClassPath: .
 Automatic-Module-Name: org.eclipse.birt.report.designer.ui.data